OMD's autofocus any good for fast moving subjects?

C-AF and tracking are for sure not as good as in prosumer DSLRs. If you compare to entry level DSLRs like the 1100D, i'd say they are on par. But keep in mind that even entry level DSLRs differ regarding C-AF and tracking.

If you are looking for a dedicated action and sports cam, mirrorless is not yet there. If you want to shoot sports and action occationally the E-M5 is OK. But you won't get as many keepers as compared to a Nikon D7100, 60D, ...

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