i wanted to see the difference among the new uncompressed and compressed raws and took some shots 5 and 6 stops underexposed. you can take your own conclusions , here are the raws:
www.tangential.de/downloads/151022-test-a7r2.zipi took two shots, each uncompressed and compressed, 5 and 6 stops underexposed.
also one shot uncompressed and compressed, each one time with silent mode on and silent mode off.
My conclusions are: at least one stop better color fidelity uncompressed, you can see this in the shadows, as well as the compressed shots show strong banding in this dark zones.
silent mode eats at least one stop, the noise floor is considerable higher with s-mode on in compressed and uncompressed mode, so this is still 12bit.
If this differences are important? ofcourse they are.. otherwise all this dr measurements would be pointless, but for certain kinds of photography its great to have so high dr as sony and nikons are having.
Probably with uncompressed files the a7rii will equal or surpass the d810 now in dr, but this has to be compared by whoever it cares