I actually shared the files with a couple of other folks and just labeled them A & B version. Certainly not scientific measurement, but everyone picked the R6 shots off of a iMac 5k monitor. I am not a sensor geek, but aware of the difference between the sensors and potential advantages.First, and this is absolutely no insult, if you knew which was which, a subconscious assumption may have biased your analysis. That's why real science is based on blind or even double-blind testing: make people rate the photos NOT knowing which camera took which. And maybe even have the person making the test not know which is which, so they don't fall into some unspoken subconscious ordering.
Second, Canon has always had sensors with the wiring on the front of the sensor (front-side sensor). The double MP sensor has twice the wires interfering with light, so it is NOT true that a hi-MP front-side sensor will pick up as many TOTAL photons as a lo-MP sensor. In contrast the R3 and one assumes all future Canons are back-side. The entire front of the sensor is sensitive to photons, whether there's 1 big pixel or a billion. In this case, while every single pixel in the hi-MP sensor will have more noise, the scene as a whole won't, so down-sampling (especially, downsampling by an integer factor like exactly 4 pixels to 1) should give an identical image with identical noise characteristics as well as identical resolution.
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