Opticallimits published the full Sony 200-600mm FE and is impressed by its performance:

The Sony FE 200-600mm f/5.6-6.3 G OSS is not a perfect lens but it is no less than a steal for the money and it alone may be a reason for buying into the Sony system – if you are really into such long tele lenses. The Sony lens is, unsurprisingly, very sharp in the lower to mid parts of its zoom range. At 600mm, the corner quality suffers somewhat whereas the center quality remains impressively high. Most photographers won’t probably ever notice this but there are limits when it comes to astrophotography here. Image distortions are present but can be handled via image auto-correction activated. This will also take care of the lateral CAs which are on the high side. The native vignetting is typical for such a lens. A positive surprise is the quality of the bokeh which is (substantially) better than most lenses in this class although prime lenses are better still.

The build quality of the Sony lens is superb thanks to a tightly assembled, metal body. Sony also didn’t forget to implement dust- and moisture-resistant seals. We can’t emphasize enough that it is unusual for a sanely priced super-tele zoom lens to have a constant physical size. Other than the obvious advantage regarding air movement within the lens, it also allows for a much smoother (easier) zoom experience compared to the usual “air pumps”. The AF is pretty fast and noiseless. We were also impressed by the real-world efficiency of the image stabilizer.

The Sony FE 200-600mm f/5.6-6.3 G OSS is a big and heavy lens and mounted to a small Sony camera, the setup can feel a bit unbalanced so adding a vertical grip may be a sensible investment for improving handling. Regarding the sum of its qualities combined with the very reasonable price tag, the verdict can only be – highly recommended!

Sony 200-600mm FE in USA at Amazon, BHphoto, FocusCamera, BuyDig, Adorama and Henyrs.
Sony 200-600mm FE in Europe at Amazon DE. Calumet DE. Amazon UK. WexUK. ParkCameras. Amazon FR. Amazon IT. Amazon ES.
Sony 200-600mm FE in Asia at Sony Japan. Sony Australia.

The Sony A7c got a very clear and honest reaction from the Sony community:

The GOOD:
Nearly everyone likes the idea to have a Full Frame camera in the smaller A6xxx form factor

The BAD:
Specs and pricing are off. These specs would be ok if the camera would cost $1,399 or less. I think at $1,399 this would have been a great entry level option for the masses. But Sony asks $1,799 and for that price I would have at least expected to get this: 4k60p, new Sony menu system, two SD slots, same A7rIV EVF (5.6 milion dot), and a better LCD screen.

The SOLUTION:
As it stands today this camera is a fail. Sony has now one only option: Give it a $400-$500 price cut in the holiday season. And as a tip for the future: Don’t repeat this mistake when they will release the A7CII in two years from now.

P.S: I agree 100% with That1cameraguy: