Can't understand why anyone is spending 4 figures on third-party glass. IMO one should be in the Nikon system for its lenses. Buy a 16-35 f4 instead, if you can't afford the 14-24 2.8. Then we won't be reading threads on how disappointed the Tammy purchasers will be.
Haven't you heard anything about how Sigma and Tamron changing the playing field with quality recently? Actually, I don't understand why one should stick with Nikon (or Canon) if third party offer quality, and in most cases for lower price. It may not be perfect but paradigm is shifting.
We have yet to see the reviews of the lens in question here. It is just curiosity for the quality in that price. I have Nikon 24-70/2.8 and 70-200/2.8 VR II. As I am not a pro, I am finding it hard to justify $2000 for Nikon brand for the wider part, which I may use only occasionally. If nothing else, I might get one - but I am open to getting a third party lens if it produces quality images.