Canon R3

[Fast Glass]

Smaller pixels are not the way to look at it. How many pixels is not the important part, it's the overall sensor noise at a particular output size that is critical.

As I said before read up on the Sony A1 review and he will say basically the same thing. At a particular output size, all the issues of higher resolution are negated. Only obstacle is how much efficiency do you loose in the process. Not what it looks like at 100%.

And in the case between the R5 and R6 it is really minimal.

Also there are the really old threads with Daniel Browning in which he gets super technical about it. If they still exist on here it's a good read.

But, in a nut shell what Daniel Browning said. Larger pixels don't gather more light, larger sensors do.

And this is a fallacy that has been promoted for a very long time, that larger pixels gather more light. They don't.