Absolutely my favorite lens. Stick to sharp, consistent focus. Basically NO coma --- MUCH less than the 20mm and 24mm Sigmas I've tried, even when used at f2.8. Solidly built. Feels very good in the hand. Now this lens stays on my D750. I've rented this and several other lenses, including the Nikon 14-24 2.8, and the Tamron consistently did a better job of controlling coma and flare, and was at least as sharp. Both do a good job of vignetting and distortion control. The extra 6mm on the 30mm…