Tamron was the clear winner for my needs. Here's why: - Image quality: the Sigma is a winner for sharpness wide open and definitely better up to f/1.8, but the Tamron is very good even at f/1.8. Both render well: Tamron shows some CA in certain scenes, but nothing that can't be easily fixed in Lightroom. I personally liked Tamron's colors best, but that's pretty subjective. In my opinion, Nikon lagged far behind the other two. Form Factor: The Nikon is a winner in terms of portability, being almost invisible on camera, but the Tamron isn't overly heavy and fits my D750 very well. On the other hand, Sigma is kind of a building block for my use case; if only in the studio and other controlled conditions it wouldn't bother me that much - Autofocus: Nikon was fastest, but Tamron is fast enough and very accurate. I ended up fine-tuning the autofocus in the +2 camera, but it worked right out of the box. The Sigma was slow and not as stable as the other two, at least on the one I rented to test. Build Quality: The Sigma feels solid, but the Tamron feels and looks better, and the fluorine coating really works if you get caught. wet. Manual focusing on the Tamron is a pleasure, with a long, precise travel and a stiff focus ring. The Tamron also offers some weather resistance, which cannot be said of the Sigma or Nikon competitors. Nikon, like all 1.8G Prime lenses, is reliable, but it doesn't feel that way to me. Features: This is where the Tamron really shines: I don't often use the vibration compensation on a wide prime when you need it, it's great to have and works really well. Great for things like taking pictures of dimly lit cathedrals and the like without having to take out a tripod or monopod. The Tamron's best feature, however, is its incredibly short minimum focusing distance - it focuses accurately to within inches of the outer lens element. Essentially gives you the ability to do quasi-macro photography without having to carry a macro around, which I found very useful and very fun when taking it out for a walk or walking around town. The VC and close-up macro capabilities really expand your creativity with this lens, which is what I wanted. Other: The six-year warranty is great. That's all; I love this thing and am excited about the purchase, so much so that I may add a Tamron 85mm f/1.8 soon.
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