Samuel H
Major Contributor
a9S could have 24 Mpix stills with all the a9 awesomeness, plus either 10-bit or 4K 60 fps. a7S III would be the same (so, either 10-bit or 4k 60 fps) but with 16-18 Mpix, smaller body, no dual card slots, etc, which at half the price would be the preferred option for everybody except people absolutely requiring the dual card slots.
What I really can't see is an a7S III with 24 Mpix, because it would have to be a very fast sensor (full readout without line skipping is mandatory for a video-centric model nowadays) and then it would be too close to the a9.
In any case, the S model(s) should have either 4k 60 fps or internal 10-bit, because I'd guess the a7 III should have clean 4k 30 fps and basically match the current a7S II in most respects, at a much lower price.
What I really can't see is an a7S III with 24 Mpix, because it would have to be a very fast sensor (full readout without line skipping is mandatory for a video-centric model nowadays) and then it would be too close to the a9.
In any case, the S model(s) should have either 4k 60 fps or internal 10-bit, because I'd guess the a7 III should have clean 4k 30 fps and basically match the current a7S II in most respects, at a much lower price.