Not sure of the 420p is worth it over 120 in a sony a7sIII
I think the a7sIII is the best performer of the bunch and 12k A7sIII combo would be great.
It could really be a game changer for sports photographers. hd cropped stilsl are at 640% zoom
False color plugins can be handy in post when color grading to step back and get an idea of the exposure variations. There is an openfx false color plugin here: https://timeinpixels.com/false-color-plugin/
Can it run on 1/2 power with one battery?
Is it 10-bit? How could the interviewer not ask that important question. Also can it output higher frame rates than it can record.