<p>Horse racing, football & baseball. In the film era, pros would carry a high-end C or N body with 300/2.8 lens, another with an 80-200 2.8, and perhaps a third with a 50 or a wideangle. I imagine that they carry about the same today, substituting full-frame digital bodies for film.<br>
It seems like a reasonable compromise for an amateur to just go with a good APS sensor SLR, and match it with the 80-200. One can add an mFT camera, or other large-sensor compact, with normal or wideangle, and do most of what the pro can do, with very little loss of quality.<br>
So I suppose my question is whether you can take the quest for compact, portable equipment even further, and use an E-M1 with appropriate glass in lieu of, say a Nikon D3s or D7100, without offsetting compromises?</p>