More AF points would be welcome, but even more important, make it a wider AF -area then on the 1DX.
That is my complain about the 1DX, I would love the AF-area more stretched. Imagine this area like a rectangle, then I'am missing some points in the outer corners. That is based on my experience in the field.
The 1D IV and 7D are about tied for the broadest spread in both dimensions (relative to frame size). The 1D X has the same lateral spread as the 1D IV and 7D, and slightly less spread in the vertical dimension (about half a row shorter).
Basically, the 1D X is giving nearly the same spread (only the two points at the top/bottom of the 7D center column extend beyond the 1D X coverage), both have a point at the 'rule of thirds' intersections, and the 1D X rectangle's corners extend beyond the 7D's coverage, with the 1D X covering a larger area with a far more dense array.
I,ve just returned from a trip to Kamchatka, Russia about three weeks ago. I was there to photograph the mighty Stellers Eagle. Often I place the subject in the upper part of the image and then I, am missing the row on top. Especially when using the AI-servo mode and a moving subject. I all the time select a focuspoint wich is best suitable for the composition. With the MARK4 the problem was less often there, but I'll like the much better quality of the 1DX. And I,ll try to avoid cropping as much as possible. I know I,am a bit cocky, but making the picture without optimizing it by cropping is the sport for me. It,s a bit like the Russians do, why make it easy when one can do it also in a difficult way?