Switching to M4/3 has been an adjustment. Some aspects are really really nice, others are frustrating. There have been some good rumors circulating the M4/3 talk boards and other photo sites of the upcoming release of the EM1 Mark II. This camera is supposed to be a significant upgrade in auto-focus capabilities in the micro 4/3 system. If this rumor proves true, I'll definitely have it on my short list! The biggest downside with my E-M5ii is the focus hunting with flying objects, airplanes and birds, and running kids. Those are the things I enjoy shooting the most, and it would be nice if the system supported them better.