[Brightcolours]

Wow, what a fanboy comment ;-)

If pros say that the R5 isn't fit for video purpose, it isn't.

The A7s has been used for years in its various versions. The S1H remains the one to beat I reckon.

That is - if you are into toys. If my income would depend on it, I'd buy a Red Helium anyway ;-)

The only actual video pro I saw doing a video who used the camera as is, said he had no actual issues with either the A7S III or the R5, on actual video shoots.

The other video pro used the R5 all rigged up with HDMI out usage, where the R5 turned off the overheating protection, which I mentioned above.

The R5 appears to actually be fit for video, and especially suited for IBIS/IS and AF usage.

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Wow, what a fanboy comment ;-)

If pros say that the R5 isn't fit for video purpose, it isn't.

   Further thoughts from this video

   from approx. 16 mins - 20mins

   

https://www.youtube.com/watch?v=Xa2zNmPatz4

  There's a lot of waffle as it's a photography debate but .....

They keep repeating the same talking points. 
Thing is, you do not shoot 4K60 in normal production, only for slomo takes. R5 with 4K30 has no temperature related shooting limitations. 
Yes, it has the 29minutes and 59 seconds video duration limitation, and the A7S III does not.