If I'm not mistaken it's all about the flange distance. It's why they can't make a Canon to Nikon adapter.
Look into the Sony lens ecosystem. There are gaps and they're expensive. You save on the body, but my god you pay in lenses.
Damn your right....Any other mirror-less camera I should look into? I am trying to get my feet dirty so I want to do a bit of everything.
P.S. I love your pictures in the photography thread.