Rob Galbraith DPI: An analysis of EOS-1D Mark IV autofocus performance

We’ll get right to the point. The EOS-1D Mark IV’s AF system shows signs of brilliance. For example, while testing the camera’s ability to track an athlete running straight towards the camera, the EOS-1D Mark IV locked onto the subject and would not let go, producing sequence after sequence of mostly in-focus pictures. In several rounds, 25 or more frames in a row were either perfectly focused or just slightly out.

Link: Rob Galbraith DPI: An analysis of EOS-1D Mark IV autofocus performance