The German reviewer from Opticallimits tested the lens and concludes:

It is easy to spot why the Tamron 28-75mm f/2.8 Di III RXD is so popular. There is, of course, the moderate price tag combined with the fast max. aperture which sets it apart from Sony offerings. Optically it is decent – for such a lens – albeit it comes with a couple of carefully placed compromises. At the wide-end of the zoom range, it is quite sharp across the image frame when stopped down to medium aperture settings whereas the center performance remains superb at 75mm which is where you’d typically use a large aperture setting anyway. Thus the mainstream settings offer quality where usually needed and you will probably agree that most of the provided sample images actually look very decent. That being said, technically there are also obvious weaknesses when using the lens on a high megapixel camera. The corner performance isn’t all that hot at large-aperture settings and for a sharp result across the frame you should stop down to f/8 or f/11. While you can certainly achieve decent object isolation via a shallow depth-of-field, the quality of the bokeh can be quite rough in difficult scenes – when shooting at f/2.8 at least. As far as image distortions, vignetting and CAs are concerned, most users will rely on image auto-correction thus you can live happily ever after. If you look behind the scenes – thus into the unmodified RAW image – you can spot medium distortions at the extreme ends. Lateral CAs are fairly low at the image borders but intensify in the extreme corners. The vignetting is also high at 28mm f/2.8 and 75mm f/2.8 albeit this isn’t unusual in this class.

The build quality is on a very decent consumer-grade level. We are not convinced that the smooth finish will stand the test of time without scratches but out-of-the-box it certainly looks good (albeit a bit long-ish). An annoyance is the tendency of the rubberized zoom ring to function as a dust-magnet in no time. The moisture-resistant desisn is certainly a plus. A highlight is the fast and silent RXD AF motor. Some users will surely also appreciate the close focus capabilities of the lens which is a classic value-add on many Tamron lenses.

If you can’t or don’t want to afford the Sony FE 24-70mm f/2.8 GM but still want an f/2.8 standard zoom lens, the Tamron is a good and light-weight option IF you can live with the rather moderate 28mm setting at the wide-end.

Tamron 28-75mm lens at at Amazon, Bhphoto, FocusCamera and Adorama. in Europe at Amazon DE, Amazon UK and Amazon FR.

Fengniao posted these detailed A7rIV images including a new comparison with the A7rIII:

Sony A7rIV and new accessories:
Sony A7rIV in USA/CA at BHphoto, Adorama, FocusCamera, Amazon, BuyDig, Henrys.
Sony A7rIV in EU at Calumet DE, ParkUK, WexUK, Calumet NL.
Sony A7rIV in Asia at Sony Japan. Sony Australia.
Sony VG-C4EM grip in USA at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, ParkUK, WexUK.
ECM-B1M Digital Audio Shotgun Microphone at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, Park UK.
XLR-K3M Mic at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, Park UK.

Photons To Photos measure the Dynamic Range of the new Fuji GFX100. As expected it has improved over the previous 50Mp Sony sensor. I do not think the new Sony A7rIV will do noticeably better than the A7rIII. Jim Kasson speculated that this will be indeed the case:

The  SNR in the deep-shadow end of the a7RIV will very slightly exceed that of the a7RIII. But even then, there will be no material difference between the two cameras in terms of shadow noise.
So, unless Sony has a trick up their corporate sleeve, the photographic dynamic range of the a7RIV is going to be about the same as the a7RIII.

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Sony A7rIV and new accessories:
Sony A7rIV in USA/CA at BHphoto, Adorama, FocusCamera, Amazon, BuyDig, Henrys.
Sony A7rIV in EU at Calumet DE, ParkUK, WexUK, Calumet NL.
Sony A7rIV in Asia at Sony Japan. Sony Australia.
Sony VG-C4EM grip in USA at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, ParkUK, WexUK.
ECM-B1M Digital Audio Shotgun Microphone at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, Park UK.
XLR-K3M Mic at BHphoto, Adorama, Amazon, FocusCamera, BuyDig, Park UK.

Preorders:
Sony RX100VII in the USA at BHphoto, Adorama, FocusCamera, BuyDig and Amazon.
Sony RX100VII in EU at ParkcamerasUK, WexUK.

Here are two new Sony RX100VII tests by Philip Bloom and CameraLabs:

Sony Cyber-shot RX100 VII: What you need to know (Dpreview).

Phillip Reeve is the first reviewer testing the new Sigma 35mm f/1.2 FE lens:

I did not spend that much time with the Sigma 35mm 1.2 Art yet but I already got the opportunity to shoot a full wedding with it (and I was using it as one of my two main lenses) and while I am usually very hesitant with my first impressions I can already tell you: this is an outstanding lens.

I think we all expected this to be a sharp lens, but neither did I expect it to be such a big improvement over its predecessor (especially being faster) nor did I expect it to be an improvement in terms of bokeh over the other fast Sigma lenses.

What I also really enjoy is how close it is in terms of handling to the Sony GM primes. Before we saw the first pictures of this lens I always argued “it may be good optically in the end, but I would surely miss the focus hold button and the aperture ring and I don’t think Sigma will include either”. Oh how wrong I was. Luckily.

Compared to the latest Canon f/1.2 mirrorless lenses I also cannot complain about the price, it seems to be justified in my opinion.

So the only disadvantages that remain are size and weight. At almost 1.1 kg this is a heavy lens. And it is a really big lens. Surely not one I would take on a hiking trip. But it was never Sigma’s intention to design a compact lens for hiking here. They wanted to design the best 35mm lens ever. And they weren’t satisfied with making it f/1.4, they made it f/1.2. And from what I have seen so far: they succeeded.

Also the japanese Fujia-blog tested the lens and says it has an impressive level of high quality!

All Sigma preorder links:
Sigma 35mm f/1.2 FE at Adorama, BHphoto, Amazon, FocusCamera, Henrys. In EU at Calumet DE, ParkUK, WexUK.
Sigma 14-24mm f/2.8 FE at Adorama, BHphoto, Amazon, FocusCamera, Henrys. In EU at Calumet DE, ParkUK, WexUK.
Sigma 45mm f/2.8 FE at Adorama, BHphoto, Amazon, FocusCamera, Henrys. In EU at Calumet DE, ParkUK, WexUK.

Opticallimits tested the Sony 85mm GM and this is their verdict:

The Sony FE 85mm f/1.4 GM is an excellent example of what a lens should look like in this class – albeit it is still not perfect. It is very sharp at f/1.4 and outstanding when stopped down to medium aperture settings. Lateral CAs are very low even without image auto-correction. The quality of the bokeh is among the best that what we have seen in this lens class. The background bokeh is especially silky. It is a bit unfortunate that bokeh fringing is not controlled. To be fair though – very few lenses are capable of doing that (the Zeiss Otus 85mm f/1.4 for instance). The RAW vignetting is high at f/1.4 and the amount of pincushion distortion is also a bit more than expected. However, once again, image auto-correction comes to the rescue so you won’t really notice this in processed images. 

The build quality is superb thanks to high-quality materials, weather-sealing, and smooth control rings. A specialty is the dedicated aperture ring so you can choose whether to use this one or the dial on the camera. The aperture ring can also be de-clicked for a smooth adjustment when shooting video. The AF is fast and silent but it’s no speed demon in this respect. 

Overall, if you are in need for the extra speed and/or just want the best native AF lens in this class, the Sony FE 85mm f/1.4 GM – highly recommended! 

Sony 85mm GM at BHphoto, Amazon, Adorama, BestBuy. Amazon Germany. Calumetphoto.de. WexUK. Jessops.

Tamron 17-28mm f/2.8 FE preorders:
In the USA at BHphoto, Amazon, FocusCamera, BuyDig and Adorama.
In Europe it’s available at Amazon DE, Calumet DE, WexUK, Park UK, Amazon IT, Amazon FR, Amazon ES, CameraTools NL.

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Marc Alhadeff tested the new 17-28mm FE lens and writes:

The Tamron 17-28mm F2.8 Di III RXD (1000 euros) is an excellent complement to the Tamron 28-75mm F2.8 Di III RXD, it offers very good/excellent performances at 2,5 times less the price of the Sony FE 16-35 mm F2.8 GM (2700 euros)
Obviously the focal range is smaller , but if you have the Tamron 28-75 it complements it without any overlap (like a 16-35 GM is overlapping with the 24-70GM)
Bokeh and color rendition are very good and similar to the 16-35 GM
Sharpness is very good to excellent and similar to the 16-35GM. The Sony 16-35mm is however better at 24/28mm at F2.8 in the corners (only visible on 42 / 61 Mpix )
If you do a blind test on a 24Mpix camera like the A7III you won’t see any difference This is excellent for a lens at 1000 euros i.o. 2700 euros !
Compared to the Sony 16-35 F4 Zeiss Vario Tessar (1100 euros), the Tamron delivers better performances
Globally an excellent Price/Quality ratio, Highly recommended

Pros
Price
Lightweight and small
Very Good to excellent sharpness
Very good AF
Limited distorsion and vignetting
No CA
Very good blurry background and Bokeh
Very good color rendition

Cons
Limited range : no 16mm, need to switch lens to 28-75 to reach 35mm
24/28mm corners performances wide open are a little bit lower than the rest of the range

More new 17-28mm FE tests:
Comparison with Tamron 17-28mm and Sony 16-35mm f/4 at Admiringlight.
Image samples shot with the new A7rIV by ThePhoBlographer.
Japanese tests at Asobinet and DC.watch.