Comment on the EOSHD Forum
The sensor for the A7S III has leaked on the EOSHD Forum, with 4K/60p and an HDR mode in 4K and at 15 megapixels thanks to a Quad Bayer pattern. If you care to take a look at the specs here – you’ll notice a few interesting things. There is only a small megapixel boost from the old 12 megapixel sensor (which rules out 8K) but a completely different architecture with 60 million photosites in a Quad Bayer arrangement, so in this respect the sensor represents a big step up in resolution and colour capture data from a standard bayer sensor.