There certainly has been a lot of discussion about the frustrations of C-AF when shooting sports and other highly mobile objects. I have experienced more than my share. I have tried all kinds of different settings including back-button focus; C-AF with tracking; anti-shock L shooting; silent L shooting and my keeper rate using the 40-150mm f/2.8 and 300mm f/4 (which is crazy sharp when I nail focus) is certainly less than 50%. I think we all hope that the Mk II will be in a vastly improved state as to C-AF (and depending on ones wish list, other improvements). I would love to get some feed back from those have had materially greater success with C-AF and what combo of camera settings they have used that they find materially superior (but I suspect not D-5 or D-500 perfect...which I am not expecting and I would not move to those bodies because I love m43 benefits too much, on balance). Feed back/suggestions please (in a positive way). Thanks.