It would be interesting if someone with both an R5 and R6 could perform MTF50 testing similar to how Jim Kasson tested the Sony A7RIII versus A7RIV. Or if no one has both, maybe split the task between two people.
blog.kasson.com
Would also be nice to test the R5 and R6 with both a very lite lens versus a large / heavy lens to see if the lens mass improves shutter shock or not.
Sony a7RIII and a7RIV shutter shock

Would also be nice to test the R5 and R6 with both a very lite lens versus a large / heavy lens to see if the lens mass improves shutter shock or not.