I saw comments where one photographer really not pleased. Electronic rolling shutters will always have some sort of issue. So, until there is a global shutter, it is to be expected. That photographer didn't care for the A1 either. But, the R3 still has 12 fps with mechanical shutter. One area where 1DXIII is better. For my needs, either is still more than enough. For those that want 30 fps, the good news is 14 bit on the R3 (there is a reduction with the A1), the not so good news is still a rolling shutter, and it is between the A1 and R3 for best in market.