I don't know. I do know that a number of my colleagues have used the Nikkor 20 mm lens for years when shooting architectural subjects using a 35 mm SLR.
Now the hot ticket seems to be the Nikon 14 mm f/2.8 attached to a 35 mm like a F5 or F6 or the full frame D3
That is if you are not shooting using a 4x5 view camera with either a 65 mm or 90 mm lens