Here is a new Canon EOS R6 review. I am glad to see that there…
High Resolution Mirrorless Comparison (Canon EOS R5, Sony a7R IV, Nikon Z7 II, Panasonic S1R)

The Sony a7R IV is DPReview TV's best camera of 2019
Here is a mirrorless comparison with high resolution cameras. Canon vs Sony vs Nikon vs Panasonic.
DPReview compared the Canon EOS R5, Sony a7R IV, Nikon Z7 II and Panasonic S1R, all high resolution mirrorless cameras.