I don't own one, but I am very interested in this lens too. I shoot the original Nikon F (plain, meterless prism) and there are few lenses that would go better with my F as a daily lens. I used to shoot the beautiful, but optically only average, Olympus OM Zuiko 40mm f/2.0 on my Olympus OM-3Ti, and I really liked the focal length.
The Voigtlander lens is universally praised for having resolution and contrast that competes with a Leica M-Summicron 35mm ASPH f/2.0 - but it unfortunately seems to have equally ugly bokeh!