Straight out of cam JPEG. auto vignette correction off. Shot on D700, DX mode off. You have to draw you own conclusions. I find it usable. Sweet spot seems to be F2.2 to 2.8.
I sold the 35mm (2nd one I sold!) since I already have 24mm and 50mm.
Subject very close, around 0.5 m. Aperture F2.8
Subject very close around 0.5m, around 1m. Aperture F1.8
Subject Further than 5m. Aperture smaller than F4 (shot at F5)