10 out of 10 points and recommendedvery sharp, especially f4 onward till small apertures like f16no ultrasonic motor (sometimes slower AF in low light), noisy VC with delay
I had several copies of this lens and all were sharp, with very good sharpness at f2.8, and all were very sharp from f4 onward. With first sample the weakest point is 50mm f2.8, but sharpness is still good at this setting. CA is very well controled, and practicaly non-existant. Distortion could be lesser, but it straightens up easily in post-production in programs like DxO Optics Pro, that also has correction profile made especially for this lens.reviewed January 25th, 2011 (purchased for $465)
AF is pretty sharp, very fast in good light, and reasonably sharp in low-light situations, but not as fast as ultrasonic-motor equipped counterparts.
Construction quality is good, better than model it replaces, but there are better built f2.8-fixed zoom lenses with better mechanics for sure.
But hardly for 465 bucks. For such a price, this lens is simply awesome.