It's a great camera. I just want to try something different and, objectively, better. After seeing the depth of pictures from my friend's Nikon DSLR, I've decided to step it up a little bit more. While I can take great photos with the GF2, I still want better. I've heard nothing but great things about the nex.
I believe I'm a fairly good photographer so I won't consider it lack of skill with the instrument. Just want to try something different.
Seems like it would be a lateral change to me (you'll lose the pop-up flash that the GF2 has)... I shoot with the 5N myself, but if I were to switch/upgrade, I would pick something that has a viewfinder and built-in flash.
Have you looked at the NEX6? Or is that out of your price range?
Outside of the bump in MPs from 12 to 16 from the GF2 to the 5N I'm not sure it would be worth it. Just my take.
Only thing that I think I would miss on the 6 is the lack of touch screen. But it has everything else you would want in a compact cam IMO.