Yea, I was going to try and scale it accurately, but the S3 is in the foreground, so there's perspective to deal with as well -- so I decided to just leave it as-is. Maybe I should've put 'image is for illustration purpose only' at the bottom...
Perspective? That doesn't even begin to explain it. That picture looked odd to me before, but after looking at the specs it simply can not happen. That sort of arrangement could distort the apparent difference in thickness and mask the difference in width. But it would exacerbate the difference in length.
You can't possibly put the Galaxy S3 in front of the iPhone and create that scene. That picture is a mess.