. . . At f/16, I see a significant difference in image quality between my fast normal lens on my small format camera and my slow normal lens on my medium format camera. The medium format image is so much better.
At f/16, I see very little difference in image quality between my high-priced 50mm f/1.4 lens and my low-priced 50mm f/1.8 lens. . . .
At f/16 any decent 50mm lens on a 35mm camera should be noticably diffraction limited. A good MF lens should be conspicuously better at f/16.