I got a chance to try a 1DX Mark III yesterday. I was most curious about the new AF point selector that's integrated into the AF ON button. I'm pleased by how it functions. It was smooth and felt intuitive. There is a speed adjustment that you can adjust to change how it works. I think there are 5 different levels you can set it to, from very slow, to fast. Interestingly, when I set it to slow and wiped my thumb the whole way across it, it seemed to move the selected AF point about the same total distance across the frame as when I had it set to fast. Having it set to fast just made it feel... Well... Faster. I think the speed adjustment is really just making it more responsive or something. I'm not sure it's a direct "speed" adjustment.
Overall I like it much better than the touch and drag selection on the EOS R, which has always felt like it takes way too much movement of your thumb across the screen to get the point to move where you want it to. (I know there are different settings for the touch and drag, but I can't find a combination of settings that makes the point move quickly enough but also precisely when I want it.)
I'm very much hoping we see this new selector on future RF cameras. It also worked in live view on the 1DX, so this is probably about the experience I would expect if they do put this selector on an RF camera.
Overall I like it much better than the touch and drag selection on the EOS R, which has always felt like it takes way too much movement of your thumb across the screen to get the point to move where you want it to. (I know there are different settings for the touch and drag, but I can't find a combination of settings that makes the point move quickly enough but also precisely when I want it.)
I'm very much hoping we see this new selector on future RF cameras. It also worked in live view on the 1DX, so this is probably about the experience I would expect if they do put this selector on an RF camera.