That's the trouble guessing when you have a pop at someone... like MF+BIF you can get a higher percentage of misses ;-)
I shot non-AF lenses for a long time, I used to have Canon FD kit for many years (strictly I still do). Used to get driven nuts trying to photograph Kingfishers... they're my nemesis.
I would average out pretty well with the folks I shoot with using FF. Steve with a 1Dx and 500 F/4 misses a fair bit and so does Chris with a 5D MKIII and 400 F/2.8. The 1Dx seems to lock faster and on target, the 7D and 5D MKIII, not as much. But you pay for it as well. On a Kingfisher coming into a perch, guess what they switch off as well after seeing what I do. The reason is simple, even PDAF cannot keep up at close range on a flying KF at 12 meters flying in. Iv'e seen it.
Here's Chris with his 5D MKIII using a wide angle on a perch pre focused ....
and my result with a crop from that shot

NEX-7 of course, but I already know that m4/3 can take the same shots with the same lenses.
Chris nailed it BTW with a really unique view. At the end of the day the question is, can m4/3 use long tele lenses to get the same shots, yes it can and it can also do what Chris was doing. That's the short answer. Can you do it with native lenses on m4/3, no doubt about it, yes you can as long as you can get close enough.
Its all about technique with MF, if you don't want to learn it, then that's fine, but never make assumptions because there is always someone out there.
All the best.
Danny.
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Birds, macro, motor sports....
http://www.birdsinaction.com
Just Kingfisher .....
http://www.flickr.com/photos/96361462@N06/