I have always and only have used Sigma lens, I started with an Pentax SF1 and Nikon 2020 using 35-70 and 70-210 lens. Now with my Nikon n80 I use 28-105 and 70-300. I shot alot celebratity, political events and they produce sharp images.
At first it was a matter of cost when I started in the late 80's now it's a choice. I may test the Nikon lens to see just how much sharper, if not significant to justify the cost different, I would stay with Sigma.
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