I can't find a recent (or decent) article comparing and discussing these two lenses. I am a D70 user (with an F100 b/u) and shoot mostly travel. I am looking for a macro lenses "for those times when I need one". Meaning - it have little interest now in spending large amounts of time with macro. The Nikon $40 rebate makes the lens very interesting compared to the Sigma. I have a bagful of both brands (AF-Ss, EXs) and have no inherent qualms with either manufacturer - both have served me well for the past 20 years!