I've seen some comparaison pictures between this version and the 360 one and it seems to me like the 360 version is a little better but nothing really important. I hope it won't be the same with Resonance of Fate though.
There's already 3 reviews on metacritic.
http://www.metacritic.com/games/platforms/ps3/staroceanthelasthopeinternational?q=star%20ocean