It seems to GX80 is a kind of breakthrough. I have never seen so much videos of high technical quality here in the forum. We already had great affordable stabilization ( like on the OMDs ) or great 4K quality ( like on the LX100), but this time all comes in a lovely affordable package.
I am pretty sure the camera used to film a movie has nothing to do with its oscarbility. Its more that excellent film maker have big budgets and like to have pro DOPs and pro gear.
Canon's APS-C sensor isn't the problem. It delivers about 6k resolution, DR and noise are far from perfect but OK. The problem starts with sensor readout, downscaling, and codec/compression. That is where Nikons D5200 and D7100 shine. They do a better job on image/video processing.