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.
The image certainly looks like a real 59MP image.
It has an aspect ratio of 3:2 and a full pixel count of 9440 x 6300, which is quite insane.
Take a look for yourself here (thanks Julian)
