My 7D II is dedicated to video now. One of my complaints with the 7D II is that it didn't have the touch screen to focus with. Using the toggle is a pain in the rear when you are trying to focus on something. It is faster than the older models with live view AF but still not ideal. In other words to me the 7D II is almost where it needs to be to be comfortable to use, but still not quite there.
The 1Dx II looks like it might finally make it to that plain. The point where I feel like video is comfortable with a DSLR.
This includes not only video but live view as well.
Is it worth spending more than those other bodies for video, maybe not if video is your only thing. If you are into video that much wouldn't you be looking at one of the Cinema cameras instead of world class stills camera?