A comparison shot from meristation (I made it smaller to fit the screen). The textures of the background environment tells the whole story, as does the difference between the two Hopes(yellow shirt guy). The top version looks to be lower resolution. Check out the full screens for a better look. It (referring to the 360 screens) is not as bad as some people make it out it to be but there is a noticeable difference when looking at it top/bottom, probably won't even notice unless the eye has spent alot of time with both versions. Though the higher the resolution of the screens, the more obvious it gets.
The you can see the full screen shots here: 360 PS3