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The r5 is a mirrorless design, not a (d)slr. Sony sells plenty of video optimized cameras in both mirrorless and DSLR designs, in particular the a7s line are explicitly video cameras which can take stills. They can overheat eventually in very hot weather, but it takes some doing.

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Canon has the EOS C70 that is more or less what you called a mirrorless design. Its just recording 4k and has a smaller sensor. So its not that canon isn't able to come up with a camera like the Alpha 7S series. And the Alpha 7s is also not able to record in 8k.

It’s much larger and I believe it has a fan, though.

None of them do 8K raw though.

More pixels more better? I'll take 4k raw at 16-bit with larger pixels over 8k 12-bit and needing more light. To each their own.

Same, but the R5 will do 4K 30p cropped for as long as you want, or 1080 60p. As will my older EOS R. The part that’s unique and that involves heat issues is 8K recording. We’re in the megapixel war again, this time between Canon and Sony, which is the only reason anyone’s complaining about 8K video performance in the first place.

I believe it was mentioned in the video that scaling 8K to 4K gives better quality (maybe by averaging out the color mosaic filter pattern?).

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