But, I'm EXTREMELY curious now after this conversation to try and rent an R3 for a direct comparison.

I do have a date to go with my buddy to do a direct apples to apples comparison with all my lenses and his lenses with the 1Dx III and his R5. And record the results along with possibly a video of it. My first hand at video making.

Because I don't feel like an extremely exhaustive comparison has ever been done.