10 out of 10 points and recommendedsharp, low distortion, low CA, very good contrast and color, fastheavy, expensive
The test data suggest you might want to stop this lens down to get the best image. But, shooting FF on a Nikon D3 my initial experience is that you can select a wide open aperture if you can live with the shallow DOF. Even at f/2 this lens is sharp on a D3. (A D3x user might need f/2.8 to see the same sharpness, but still find f/2 very usable.)reviewed August 8th, 2009 (purchased for $1,423)
This is a manual lens, if you need fast focusing, you should skip getting this lens. Also, my D3 gives a green focus confirmation indicator when the focus is still a little off. As a non-CPU lens, fine tuning this is not possible. So, live view (tripod mode) is essential for getting really accurate focusing at wide aperture.