Optyzcne.pl carefully measures the resolution of sensors. They find R6 ii at f/4 resolves 64 lp/mm https://www.optyczne.pl/485.4-Test_aparatu-Canon_EOS_R6_Mark_II_Rozdzielczość.html and the R5 82 lp/mm https://www.optyczne.pl/457.4-Test_aparatuCanon_EOS_R5_Rozdzielczość.html That gives the R5 a measured 28% advantage with a sharp lens at f/4, close to the theoretical.Yes we are dealing with an area X*Y, so a big increse in megapixels doesn't always relate to a big increase in actual sensor resolution. I'm finding a slight increase in detail between the 24mp R6ii and the 45mp R5. I honestly thought there would be more. Sure...bigger files and more pixels for sure, but not that much more actual detail at 100% or even both viewed side by side large. The R5 has 87% more pixels, 36% more inlear resolution, however I would say that the increase in actual detail that is observable in the final images (while subjective) is a lot lower, maybe 10% more at most.
For narrower apertures the difference decreases, and drops to about 10% at f/16. Low quality lenses will also lower the difference as will poor technique. I could see the significantly better resolution of bird plumage using the R5 vs the original R6.
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