It worked on my 5D2 and 85/1.8 combo! This is the first time I have any consistent results from AFMA!
A value of -10 makes my full length portrait much sharper at f1.8 at a shooting distance of 12 to 17.5 feet.
A -10 AFMA would however make any shots less then 10 feet away slightly OOF and I am not surprised as this appears to be one limitation of Canon's AFMA implementation to date IMHO. Canon's AFMA appears subject distance dependent.
For that kind of shorter distance (< 10 feet), I needed to turn off AFMA to get a sharp image.
It seems that Canon's factory lens calibration is much better than can be achieved by on-camera AFMA, as far
as distance dependence is concerned.
Now sigma has the USB lens dock for focus calibration, I hope Canon would catch up quickly by offering a Canon USB lens dock so we can perform factory quality lens calibration at home...