I've spent probably too long thinking about the same issue, and should probably just get out there and keep filming more with my 5d3. But in case it helps, to summarise where I got to... accepting there are lots of ways to make great videos, if you want 1) reasonable AF in video 2) acceptable sound from the camera or a hot-shoe mounted mic in a quiet environment, and 3) camera/lens stabilisation without a gimbal, etc then the list is fairly small. Even more so if you want 4k, although it doesn't sound like that is an issue for you?
As others have said looking at Philip Bloom's tests and others, only really the Sony A6500 or Canon 70/80d autofocus (from your list) give reasonable performance. If you go with Canon and want IS and no autofocus noise then the options are small - 18-55 or 18-135 STM/nano-USM lenses. With the Sony you have the option of IS on a zoom, e.g. 16-70 or 18-105, as well as IBIS with the quieter sony primes e.g. 24/1.8 E, 55/1.8 FE (if you can live with focus breathing on the latter) which will give you more options, all while keeping on-camera sound reasonable.
As others have said you could go with a G80/G85, or for more money the OMD EM-1 ii, but neither autofocus nearly as well.
Happy to be disagreed with though - always good to learn!