I currently shoot with a Sony NEX 5 that has served me pretty well over the last few years. I've been using a mixture of the Sigma 30mm 2.8 and some legacy primes. The things I'm struggling with with my NEX currently: NO VIEWFINDER has been brutal. Slow AF slow startup. Lens selection (really need a fast normal lens and maybe a cheaper long zoom for vacation shots) The other day I stopped in a camera shop and played with the OMD and was FLOORED by the AF speed. My question to you guys is, would I regret the change to a smaller sensor? Have any of you switched from APS-c to m43? How was the transition? Thanks!