I'm really happy i bought this lens. I shoot with a Canon 5DIII and am a commercial portrait photographer. I was looking at the canon options for 85mm primes but decided that the 1.8 wasn't good enough and the 1.2L was too expensive. If you are thinking the same, this is a great option. I am really impressed with the image quality as well as the fell and build of the lens. The autofocus is a little slower than some of my canon lenses but I don't find it ever an issue. Hopefully you know how great prime lenses, and this is no different - great for shooting handheld in low light and for a shallow depth of field. If you need (or want) and 85mm, this is a brilliant choice.
My first Sigma lens and I have to wonder why I've not taken the leap from Canon to Sigma sooner? Outstanding quality all around.. I've zero issues with this lens and I'll be saving a lot of money in the future!
For most photography most of the time the Sigma is an equal match to the current Nikon 85 1.4 G. It really is. The Nikon's ergonomics and handling are a touch more smooth/mature perhaps, but if I was you I wouldn't blow the difference hoping to see better images. I've got plenty of images on my website taken with both lenses. You wouldn't be able to tell. I sold the Nikon, and bought a bottle of whiskey with the change.
What a great lens, what I really wanted was Canons flagship 85mm 1.2 but at over £1500 it would be a while before I could justify that I bought this as a trial but needed have worried, it's quickly become my go to lens for studio work, it's much lighter than the Canon, love it. And the Canon? Weeellllllllll...... Maybe
Best value 85mm lens for Nikon. Built quality is much better than Nikkor 70 200 2.8 VR II which I had. Half the price comparing to Nikkor 85 1.4G. It's sharp (at 2.8 better than Nikkor 70 200), fast, feels solid and price is great.