I'm just not getting this: I'm sorry, I'm still back on this point. But, suppose I want to measure sensor sharpness. Why, I don't know, but this thread is about sensor sharpness. I use a 5D Mark III with a 35 f/1.4L. I then use a 7D, with a 16-35 f/2.8L II at 22mm, hypothetically.
How is this not apples to oranges? You switched lenses?? Which is sharper, the FF or the APS-C? I don't know, because I don't know if it's the lens, or the sensor, or both, or neither.
Neuro's test, to me at least, isolates sensor sharpness only, and leaves no other, or fewer, variables that could influence the test other than pure sensor sharpness.
Nothing personal, I'm just not getting what you are doing.