Unforgiving is the word. The image quality is stunning iso 3200 and 6400 isn't bad either.
I have shot with that set up, in fact, experimenting with using just the single center, and only allowing shots when focused. It has been suggested to me that the 85 G lenses might be faster. But this is a volunteer shoot, for the Catholic HS I went to, and I am not upgrading my lens for just this reason.
Are you using the 3d at all, or do you feel that is better used in a left-right plane movement.