Not exactly ..
To tell the truth, I will have a world quadbike race on 21/22 of august in Pont de Vaux, and till now, 135L2.0 (my favorit gear) was a bit too slow and too long for a 580EXII for night shots. So I used to take a 24L1.4II, but I need to be really too near the track which is not really safe ..
So I wanted last week end to give a try to my 85L1.2II mounted on a 5DMKII and I kept a 300L2.8 mounted on a 50D.
But after all, I got good result when I pre focused early enough in
AI focus mode...
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Of course with 300L2.8 it's easier to catch focus, but I would say that 5DMKII+85L1.2II I got pretty good results (I would say 70% accurate) ..
I feel more and more that with a minimum technique, it's like an urban legend that 5DMKII and 85L1.2 are the worst for AF .. I think I don't get much better AF results with 5OD or 135L2.0 .. but I am still not sure I will take the 85L1.2II