Many moons ago I did some tests on Nikkor standard lens, back when I had four different versions at work, talking Pan F and Nikon F2's 😉
Nikkor 50mm f1.2, f1.4 & f1.8 plus a series E with no coatings left on the front element, from a press guy constantly cleaning it with his elbow!
Anyway we shot off a few test shot using a Bowens Illumitran (remember those beasts!)
Then compared the shots, ok, cannot remember what F-stop it was now, but the shots taken at F5.6 or F8, no one in the office could tell the difference between the lenses when a segment was enlarged and printed up.
Was a boring afternoon at work btw 😉