took a few photos of a friend's new kitten, started with the 6d, then realized I was having a lot easier time with the em1 to get quick shots of a very quick moving kitten
One problem/handicap with m43 is that, in spite of the extra DOF that you get, you cannot get a good star burst effect. If you stop the lens down all the way down to f16 or f22 the star burst is just okay, but diffraction becomes a real problem. The camera/system that gives you very nice/long star bursts is the Sony FF mirrorless cameras.