Sorry, but no.
The R does not shoot raw video. It shoots 8 bit 4:2:0.
AFAIK it does not have a waveform monitor - which is near essential for properly judging exposure for chromakeying among other things.
And the 4K crop is nothing like Full Frame.
You can get those things in a camera today, but your options are the Arri Alexa 65, Red Monstro, Sony Venice (with external recorder for RAW), or Canon C700FF (with codex recorder for RAW). All of which are high end cinema cameras costing between $40 and 128k, not mirrorless still/hybrid cameras available for $2/3k.
I'd wager that 95% of those who profess to want such things wouldn't be able to cope with the workflow anyway - shooting S35 4K RAW on a C200, a 256GB CFAST card gives you half an hour of footage. Securely storing that kind of volume of data isn't a problem if you have a 120TB video editing server, but if you're not a post production house you dont have one.
I guess if all you're doing is articulating weird 'i want' filled tech-based wet dreams that kind of practical point doesn't matter though.