AM's 40nm design missed its spec by a lot. HF's GN1 28nm exceeded it's spec and the GN1.5 respin will be even better.
The fact that AM failed and still came out with a superior chip is quite the achievement.
As for GH/wafer, I don't think either of us knows which is superior. But I'm sure you will pretend you do, just to be a Negative Nancy as usual.

Without a doubt hashfast has better GH/wafer. But because it requires an expensive board/cooling it is not competitive. Even if the chip was free I doubt they could sell hardware for 1 btc/gh (at 0.7 w/gh).
Regardless, the battle for 4th gen ASIC dominance is happening at 16nm. HF's 3d finFET GN2 design is just waiting for a firm like AM to buy it and put it to work.
By put to work I assume you mean completely redesign the chip/pcb and hope it works?
Does AM have any provisional patents? HF does...
I'd love to know how HF acquired a "provisional patent" considering no such thing exists.