Upload & Sell: Off
I just got my adjusted lens back from Sigma. There is no noticeable change in behavior. All focus points but the center one backfocus consistently, and the extreme outer points backfocus severely.
My standard AF setup is AF-C, 11 points, single or D9, Focus+release priority. I use 11 points instead of 51 to make moving the point around the frame faster. For sports, or tracking moving objects, I adjust this, but for people, which is what I shoot most, this is my standard.
Of the points that are enabled in 11 point mode, the ones in the 4 corners are the ones I use the most. These align fairly well with a rule of thirds composition, and more often than not, I am focusing on someone's face or eyes with one of these four points.
I may try and use AF fine tune on my D800 to align these points, and let the center point front focus after the adjustment, since I rarely use the center point when shooting people. I want this lens to work really badly. I'm pretty disappointed that Sigma's prescribed fix seemed to have no effect whatsoever.