This lens is EXCELLENT in all aspects:-
1) For a wide angle, there was minimal distortion. This was verified.
2) Light falloff was minimal as well, even wide open at f/2.8
3) f/5.6-13.. the lens is so sharp, its unbelievable.
4) The autofocus speed was very fast with minimal hunting, thanks to AF-S (i.e. Silent Wave Motor).
5) Perfect for 1.5x crop (all current Nikon dSLRs)
I have not tested this on 35mm film (or FF), but will do so soon, and let you know the results. My guess is most people are interested in digital SLRs now, so that finding may be redundant, as Nikon's are 1.5x FOV crops, at this point.
I would recommend this lens hands down.. works out to an effective focal length of 25-52mm.