Upload & Sell: Off
The first copy I received was way off too, I was at -20 micro adjust and it wasn't enough. that's just way off for a new lens, what would I do if I went to sell it on to someone who didn't use a cam with MA in future? I sent it back and demanded a replacement. Sigma told the sotre I bought from that I would have to wait until they checked it out, I was having none of it. Told the store that was their issue with sigma, not mine, which is true. So they did send me a fresh one, fair play.
Sigma have a rake of excuses re: this lens. Especially once they hear "D800" from the customer. They will try make out it's user error, that you just can't handle such a packed sensor at 1.4! The cheek!
Demand a replacement, you have every right to.
The 2nd copy I got is perfect, no issues.