On the EOSHD forum a second image, supposibly from the A7R II has been pointed out. This one has full EXIF data and shows the camera model as A7R II, resolution 59MP and the lens used in this case is the 55mm F1.8 FE mount.
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Feast your eyes on this 9K image from Zeiss. Sony Alpha Rumors makes a good case for it being from the updated A7R II. I’d say it has a good chance of being real and here’s why…