My other fast lens, 135L, looked fine at -1 MA, but I noticed recently that for my main usage of the lens (full height portraits, meaning you have to be really far, with my crop camera), f/2.0 shots are always very slightly off. My newest zoom, Sigma 17-50 OS, was tested to work fine at -2 MA, in real life environment. with a few shots at each zoom and each distance you can get a pretty good feel on what MA is needed.
I didn't even need to use a tripod, remote shutter release, mirror lockup etc. Then I discovered that I get better results by hanging a large printed target on a wall in my backyard, and shooting it from realistic distances on a sunny day. ) of my lenses, and was never happy with the real life results. I spent a lot of time doing indoor testing (printed targets, computer monitor with moire patterns.
From my experience, for best results in focus MA, one really needs to have the environment as close to real life shooting as possible - meaning both correct light (use daylight, not fluorescent / LED / tungsten), and distances (if the typical use of the lens is full-height portraits, the size and the distance to the printed target should be chosen accordingly).
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