Ok, fair enough. The next question is, does anyonr really use the video capability of their MF cameras at all? If not, why not?
The Phase Backs, currently have no mic, at least last time I checked. There were several early posts of video from the 3100, but as I remember there issues, both in regards to 4k (not available) and very slow frame rate, thus rolling shutter for anything moving similar to rolling shutter for ES (however reversed as with the ES it's something moving across the frame).
Hasselblad has video output with a mic, not sure on the 4K. But I have not seem very much if any video, but i am sure it's out there.
The area where P1 has a very strong possibility is the use of time lapse, thus turning the individual images into a video. Lots of nice work out there for this, and it's 4K. DT has a very strong toolset for this (software), and the XF has a very nice, well thought out timer and built in intervalometer, and you can turn off the dark frame when using the intervalometer, very important. And (OT) proof that P1 could allow this for all photography if they so wanted.
My only issues are the sizes of the files, which are huge and have a lot of overhead when being processed. But end video is very good.
The 50MP backs, from Fuji and Hasselblad have video, Hasselblad 4K, Fuji not. There are some nice video's on the Fuji GFX facebook page.
For me I will stay with the Gopro hero 6, which is a big improvement over previous models.
Paul Caldwell