WexPhotographic compared the size of the new Fuji GFX medium format camera versus the Sony A7rII. The GFX sensor has a 60% larger area. Not sure that’s enough to not a “real” image quality difference. By comparison the Full Frame area is 130% bigger than APS-C.
Sony A99II preorder links:
In USA at BHphoto, Adorama and Amazon.
In Europe at Calumet Germany and WexUK.