As a non-video user of cameras I do find the improvements to be nowhere near enough to entice me to upgrade.
The biggest upgrade I am seeing is in the price point. Here the 1Dx is selling for just over $5k while the mark II is listed at $8k. Is it just me or is that a rather steep increase for what amounts to small increments of improvement for use as a still camera?
Are the video improvements enough to justify the increase for those applications? Are the video specs that much better than what Sony and Black Magic offer, amongst others, to more than double the price tag?