the gap between PS2 and DC was quite big, bigger than the gap between PS2 and Xbox, but devs are lazy you know...although i must admit Soul Calibur and SC2 looked very similar, and Virtua Tennis 2 looked pretty much the same.
About the WiiU Ps3 comparison, is well known WiiU ports are going to be optimized, WiiU is actually a more powerful hw, no surprises there