I'm looking to record youtube videos/videos in general at high quality.
Quick autofocus would be very helpful
Well, I can only think of a couple.
The lumix gx85 has 4k and a stabilized sensor, but the af is a bit iffy. The lcd tilts up and down, but not sideways, so vlogging style is impossible.
Then there's the lumix g7, it has 4k and a lcd that flips sideways, but the af is still lacking and the sensor is not stabilized.
The lumix g85(not the gx85) is $700 so really in the price bracket you want, but has a stabilized sensor, 4k and a flip out screen, af is a still a weak spot.
All these cameras have a crop factor of 2x by default and at 4k increases to 2.2x. (full frame equivalent), so the kit lens will normally be 24mm...