I haven't got 8K eyes.

It seems that several people have spotted a gap in the market.
https://ebay.us/RgZsfN

Saw this on YouTube https://youtu.be/Q4y2-8hUbFQ

Having thought about this, with all my vintage full frame lenses, even though there are focal reducers for MFT, the A7iii is my lottery win camera. There's full frame video footage using a Sony and a 60's Helios lens on YouTube and it's amazing.

Neither are bad cameras. 4K 60fps vs full frame loveliness. The deal breaker for many people must be that a year or two down the line, will the market for what they create demand 60fps or not? Like many thought they would demand 3D for everything.

I have some Helios 44 58mm f/2.0 lenses. Very capable of bokeh as you might expect but one of the properties of being a (slightly imperfect) Tessar formula lens is that the bokeh swirls around the edges.
The Pentacon 135mm f/2.8 has the nickname of Bokeh Monster, but is probably rather too extreme for video work.