I haven't got my hands on an E-P2 yet, but I'm kicking myself for buying the E-P1.
I like it, but the one thing that would have swayed is the viewfinder and now the E-P2 solves that problem I'm annoyed.
Early adopters always suffer, and I'm not impressed that I got suckered into buying the E-P1.
I would say the E-P2 should get it over the E-P1.
Provided there are no quality/speed compromises in adding the EVF.