If you are going to test older lenses- they will likely need a "CLA", which will cover differences in manufacture. Otherwise- how do you know if the variation is from manufacture, or from use?
I'm reminded of a test done in the 1970s of lenses and cameras made in the 1930s. The 5cm F1.5 Sonnar being tested did quite well except for one corner, which could have been corrected with a CLA. At some time, it had taken a knock.