perfect picture quality in the center of the frame
very good picture quality at the edges of the frame from the 80 mm to 135 mm focal length range
small chromatic aberration
perfectly controlled coma
almost completely absent distortion
small vignetting
great performance against bright light
very good quality and sturdiness of build
fast, quiet and efficient autofocus
lots of standard accessories (tripod collar, lens hood, solid carrying case)
Cons:
slightly less sharp at maximum aperture
visible astigmatism
We praised the Sigma 70-200 mm f/2.8 so we should certainly praise the Nikkor 80-200 mm, which, in our opinion, received somewhat better results. Its picture resolution is a bit better, especially at the edges of the frame; it corrects the coma much better and has smaller vignetting. The Sigma is, however, better at astigmatism correction, has a longer guarantee period and, of course, a lower price.
I think that the choice is pretty hard. Those, who hate compromises, will buy the Nikkor. For those who count every penny, the Sigma will be a better investment. Both lenses have great and similar capabilities, so either choice will be accurate and customer satisfaction in both cases is definitely guaranteed.