Basically if you want 4K and DPAF at once from Canon without hefty crop then you need to buy at least a C200
Many people are feeling locked into Canon, it might be worthwhile seriously considering if it is worthwhile jumping ship to Nikon/Fuji/Panasonic/etc instead
Lots of good info here already.
One of the things that you have to understand is that you're in a situation that many here have found themselves in, being invested in the Canon ecosystem with lenses, and wanting to do great video while also enjoying the Canon colours and the great focus performance. Canon offers great quality from their cinema cameras, but unfortunately, when it comes to video quality from their non-cine cameras they are a long way from the top.
Depending on what your expectations are, and what level of image quality you're willing to accept, there's really a few options:
Stick with Canon and just be happy with the quality available
Switch to another system that offers better video quality and keeps reasonable autofocus abilities, but have to reinvest in another brand (eg, Sony)
Switch to another system that offers better video quality and keep using your lenses but sacrifice autofocus (and have to play with adapters etc)
It's really a situation where no manufacturer offers everything, and you have to pick two out of these three:
great colours
great focusing
great video quality
You can also choose multiple brands of camera to keep your kit as flexible as possible (eg, have a camera that doesn't do great AF for interviews etc, but another with fast AF for gimbal work) but then you introduce the challenge of matching your cameras in post, assuming you used both cameras on a project, or want consistent colours between projects.
There's no wrong answers, and I'm sure you can run a successful video business with Canon quality video, but every time a new camera comes out many of us here get all excited because we're all still chasing a camera that can really perform across these three aspects.
Good luck
