Get Nikon 20mm f/1.8G at B&H Photo.
I shot the 20mm f/1.8 today on the Nikon D810. A fun lens to be sure.
Coverage soon in DAP.
Update: the 20/1.8G is driving me crazy with pronounced errors in exposure value (EV). In series after series, it is off as much 1.5 stops in some apertures versus others, e.g., f/5.6 @ 1/60 might be a full stop too dark (or more) than f/2.8 @ 1/250. Having only one sample, I cannot know if this is the particular sample, or some general trait. Shooting manually of course, so there can be no error in EV calculation. Fixed ISO, equivalent EV as in my wont when shooting an aperture series.