[Klaus]

Honestly - if you are serious about 8K movies, just bite the bullet and buy a RED Helium or Monstro
https://www.red.com/dsmc2

And if you are a vlogger, you really don't need 8K in the first place.

I reckon you may need more than an hour for:
* sports
* conferences
* some kind of surveillance
* timelapse
* weddings?

Whether 8K and/or an R5 if needed for that ... well ...

That being said - if you are a photographer, 8K could be nice for selecting the perfect shot if your subject is particularly nervous. Meercats! ;-)