My experience with sports and the em1 is limited to grandkids - an indoor basketball game worked out reasonably well (no flash allowed - so high ASA and some blurring using the 14-150 mm f4-5.6 lens. I was in the stands). Fast action, such as birds flying overhead or to side, no problem, using same lens. Blue-footed booby looked real good. Just have to have quick reflexes - camera works fine. Continuous shooting in raw - don't know. I always shoot raw, but rarely use continuous shooting. From my exceedingly limited experience, it works. I should also note that if you intend to photograph a lot of real sports (pro sports), the em1 is probably not the camera you want. That's, I think, where the huge expensive heavy nikon and canon shine, with their huge and expensive lenses - heavy heavy lenses. Personally, I would prefer not to walk around with those cameras-lenses on a hot day. Or any other day, come to think of it. But if you are paid to photograph pro sports, those become essential. The em1 with any lens, and the Canon EOS 5D Mark III with a EF 70-200mm f/2.8L IS II USM pro lens, are obviously not in the same ball park.
Thanks so much Arthur, that was very helpful. I'm not looking for pro sports, just to do an adequate job as a hobbyist. Thanks again.