Incidentally, that probably matches up pretty nicely with that hypothetical AC remake situation anyway in that you could safely skip AC1. Xenosaga or the first parts of a Telltale graphic adventure series that sure as hell isn't, and that's admittedly doubly true for Atelier far as I can tell.
EDIT: Actually, how IS the performance on average compared to the PS3 version? I guess being an RPG that had erratic performance in the first place it's not really a big deal, but still it'd be nice to know if it actually dips below the PS3 version at its very worst, and inversely if it can still hit 60 fps every so often.