I got one with lower than average price due to a small problem with handling, but optically it's as good as the legend goes. At wild open, coma isn't 100% corrected, however, if you use it from F1.4 to F4, the sharpness and contrast are brilliant! The AIS version has 9 diaphragm blades and very good bokeh. On the D200, focusing is not exactly easy at aperture larger than F2, the bright AF focus screen doesn't help either, as the depth of field isn't correctly shown- you need to rely on the focus indicator, which works. Even with its slightly longer focal length and larger aperture, it's less likely to flare compared with 50/1.4 AI. For this lens, I quit buying any camera or lens for more than half year now, but it's worthy.
On full frame camera and normal working distance, this lens is sharp from wild open, and corner sharpness is best of all the normals I tested. Stopping down to f2.8 and f4, it also shows amazing sharpness and contrast compared any other lenses. The only problem is, if you want make use of f1.2 or f1.4, you have to get the focus right- which is hard even with the focus indicator.