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.