You are correct. However, we would expect them in a first approximation to change in parallel. You have brought out the real geek in me and I have gone to the Imatest test plots they present to calculate the MTF10s. They present their Imatest data at f/4.Except that MTF50 is not a measure of resolution. MTF10 is more a measure of resolution, and MTF50 is more a measure of perceived sharpness.
MTF50 for 5DSR is 0.322 cy/px, ie 78.8 lp/mm
MTF50 for 5DS is 0.274 cy/px, ie 67 lp/mm, the 5DSR being 17.6% higher (average of horizontal and vertical)
Reading the noisy plots gives:
MTF10 for 5DSR ~0.71 cy/px, ie ~173 lp/mm
MTF10 for 5DS ~0.57 cy/px, ie ~139 lp/mm, the 5DSR being ~25% higher.
https://www.optyczne.pl/324.4-Test_aparatu-Canon_EOS_5Ds_Rozdzielczość.html
https://www.optyczne.pl/312.4-Test_aparatu-Canon_EOS_5Ds__R_Rozdzielczość.html
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