As with others, I debated on this lens due to numerous negative reports concerning focusing issues. My worries were unjustified, at least with my copy. Focusing is dead on using my 5D at any distance and does not seem to vary between shots. As is my habit with the 85II, I always use the central focusing point for wide open shots and have not had a problem yet. It does back focus slightly (but much less than my 24-70) at close distances on my 1DII, but again it is consistent.
In pixel peeping at short distances shots of a printed page, it is a little soft, improving up to about f 2.0. However, in real world photography I find it very sharp and use it at 1.2 where ever possible.
Highly rated. I think it complements the 85 and 135 nicely for a combination of fast lenses. Take the plunge!