They are focused on different points. The Galaxy is focused closer than the 4S; the details on the Belkin card reader (in particular, the edge contacts in the slots) are clearer on the Galaxy, and the difference is even more marked on the keyboard letters. The Galaxy also has a higher exposure. On the book paper, the lack of focus combined with overexposure has causing some bleed into the type; but it shows better detail in shadow areas.

Much of a muchness, IMO. The two are very close, and aside from things like color temperature (which I personally would discount and tweak later if desired - though I wonder if the white balance is configurable on either phone), they are all but equal.