Cinema 5D interviewed the product manager of Alpha about the difference between the Sony a99 Mark II and Sony a7R II. From the interview the a99 Mark II performs better for photography and should have the same level of video performance as the a7R II. For Photos A-mount lenses are the fastest, but autofocus can only be use used in P mode when doing video with A-mount lenses at this time and there is S-Log 2 and S-Log 3. The Sony a99 Mark II is also better than the Sony a7S II for video when doing Super-35, but not when filming full frame. If you’re new to Sony the a99 Mark II might be a good starting point.