B&H only took about a month to fill my preorder. I LOVE it. Zero fine tune and it is bitingly sharp wide open. I wonder if I should look into selling my Nikon 85G 1.4 for the Sigma? I had one early on and the focus hunt was terrible. Probably a bad copy.
Playing on a dreary evening... I don't actually think the build on this lens is Zeissy. It's good, but it's pretty light and not really the tank I expected it to be. Focus is fast. It seems very accurate, easily as accurate as 35L was for me on 5D3 if not more so. Definitely sharper wide open than 35L was.