I'm actually surprised by the positive reception thus far.
As mentioned earlier, I paired the 20mm with a D700 once and didn't really think much of it.
For the price, it is certainly decent, and I don't think I ought to be expecting the sun and moon with the lens.
Yet, the flaws are quite obvious on FX, and i'd rather go for any other f/2.8 zoom lens that covers this focal range than to use this lens.
Wide angle primes were the Achilles Heel of Nikon for a long while, and I am quite thankful and impressed by the latest and proposed additions by Nikon.
Meanwhile, this lens isn't all that bad once you factored in the cost. My opinion is that I'd only pair this with a FX camera, and I think I can get much better results by getting the Nikon f/2.8 zoom lenses. Of course, the zoom lenses are astronomically priced when compared to the 20mm prime, but i just think that if I were to go FX, I ought to have the cash.