Thanks for the tests! I will reiterate that using autofocus is not the best way to test lens sharpness, since you're not testing just the lens, but how well the lens is matched to the camera's AF. Also, an angled ruler is a challenging target for the AF system. So, while I appreciate the efforts, and acknowledge this test has meaning for your camera+lenses, I don't believe the results can be generalized to these lenses as a group, due to the confound of using AF (with no ability to calibrate it).
I understand about generalizing the tests for all lenses.
However, grant me this... if I saw the numbers sharper at the higher or lower end of the scale (lets say 13" or 11" etc, then it would indicated forward or back focus, this is not the case, the lens is correctly focusing at 12"
The older 70-200 (1st pic) has a slight back focus, however it is still withing the dof and captures 12" at good sharpness. The second is centered at 12" meaning it is optimally focussed.
Given that the slanted ruler, an inaccurate focus would be visible either up or below (instead of 12"), thus I still believe, this test is valid for this set of 3 lenses.
The proof is that maximal sharpness is visible between 11.5" to 12" for all lenses.