Rudy Winston, a good guy and tech expert from Canon, has an online series describing the new 5D / 1DX AF system.
It is a good article. But nowhere does it say to stick to "single point AF" if you want fast AF. So unfortunately it's one of those things people need to learn and then share that knowledge. I wish it had been documented, because I would have used it last night and would have gotten more keepers from the reception.
if we had to use single point AF for the camera to focus properly to achieve a sharp image, then what's the point of putting 61 pt. AF when it will be useless other than a maketing strategy. As far as I understood, those points when selected will be the basis of the camera to focus on regardless of other settings. What's the point of having zones or expansion points if focus cannot be achieved? Does this mean we will need to use the 61 points individually?