Below are crops from our laboratory Still Life target comparing the Canon EOS R’s JPEG image quality to its more expensive DSLR sibling, the Canon 5D Mark IV which uses a very similar sensor, and to the 6D Mark II DSLR which is less expensive and closer to the EOS R in build quality. We’ve also compared the EOS R to its closest full-frame mirrorless competitors, the Nikon Z6 and Sony A7 Mark III, and have included the Fuji X-T3, the only crop-sensor (APS-C) mirrorless camera in this comparison. Remember, you can always use our Comparometer to compare the Canon R to any camera we’ve tested.

NOTE: These images are from best quality JPEGs straight out of the camera, at default settings including noise reduction and using the camera’s actual base ISO (not extended ISO settings). All cameras in this comparison were shot with our very sharp reference lenses.
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https://www.imaging-resource.com/PRODS/canon-eos-r/canon-eos-r-image-quality.htm