Comparing 25k ISO to 12k ISO of the R6. The R3 is holding it's own with it resolving the numbers even slightly better. Probably due to the extra resolution.

All in all a solid stop to my eyes. Which is no easy feat as the 1Dx III/R6 already had very clean files to begin with.

All in all the new sensor tech looks fantastic. Now they need to release the high res big brother the R1! I am just imagining 45 mp (Or more) with this new sensor tech. Oh so good.