Thanks to you all that respond. I've been wanting to try the NEX line, but cannot really afford another system. So was considering just moving completely to NEX. I don't have auto focus lenses at this time for my E-p2, just my adapted lenses. I stay mostly with 24mm and 50mm now. I'm pretty flexible with focal length in that range. I do mostly outdoor rural, close-in and macro, with occasional family pictures.
If you want to only shoot with native lenses, then Micro Four Thirds is preferred system. There's already a huge native lens base with still even more coming.
BUT....like you said, your only lenses are adapted ones and if I was only shooting with adapted non-native lenses, then I'd go with NEX for sure!