They have an HD comparison video up on gametrailer.
Basically the same.
Perhaps I am only imagining this but the really fine details seem to be a bit sharper on the 360. On the other hand colors are nicer on PS3 and somehow the world seems to be a bit more three-dimensional. And explosions looked somehow better on the PS3.
In the end both versions are the same. Oh and both look awesome. The city is amazing. Especially at night.







