I did a PIP of the two versions just now and the 360 version has a much warmer look to it. I feel that the PS3's look is much more what the game is suppose to look like, very bright and clean. If you didn't play them side by side you probably would never even notice a difference.
Here's a not so high quality picture but it gets the point across. (you can kind of see the difference in aliasing if you look at the edge of the roof)
Here's a not so high quality picture but it gets the point across. (you can kind of see the difference in aliasing if you look at the edge of the roof)