DxOMark published their testing results for the Canon EOS R3 camera sensor - here is their conclusion:
"The introduction of a ‘3’ series pro-oriented camera with a built-in vertical grip sitting mid way between the existing top-of-the range ‘1’ series and the popular ‘5 ‘ series is a little confusing, especially as the new model appears to take on the role reserved for the Canon EOS-1DX Mark III DSLR. While we’ll have to wait and see what form a possible top-of-the-range EOS R1 takes, the Canon EOS R3 is certainly a compelling contender for its intended market. Not only does it have excellent dynamic range at key low, mid and high sensitivities, it has the best low light performance of any full-frame camera in our database. This makes the Canon EOS R3 a very attractive option for Canon EOS-1DX Mark III users transitioning over to Canon’s mirrorless RF system and it’s a solid option for any photographers new to the Canon brand."
Here are the top-rated cameras according to DxOMark (the Canon R3 is at the #15 spot):
Via DxOMark
