i don't think the ps3 will look wost than the 360 it might have a bit of a edge RE started with PS i don't think they well do a crappy port as with DMC & GTA4 all all started on PS both have a edge over 360 but well have to wait for the reviews to find out
As for the demo being out on 360 in JP that is a bad idea look wat the TRU demo did for 360 sales there lower than PS3's
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