Should I stick with Olympus?

[usayit]

^^exactly.

When I use my 50mm on my FF body, it's a normal walk-around type lens. When I put my other 50mm on my E-P1, it's a telephoto (100mm equiv) and works completely different. It's not better or worse, but just different.

A little off topic...

You have an E-P1 now? I recalled you sold your GF-1 kit several months ago...