I am still figuring out the forums, so bear with me.
@Andrew, the 4:2:2 10-bit color space is about as good as you can get for prosumer level cameras when it comes to pulling a clean key. The only better options are 4:4:4:4 or RAW, and the cheapest option with those specs is something like the Blackmagic Ursa Mini.
I believe the Sony mirrorless cameras (A7x/A9) all output 4:2:0 8-bit color.