I also shoot with a D800, got the lens and been using it mainly for street photo, on my camera focus was alright, no issues at all with it, maybe because its much cheaper than nikon glass, but I feel comfortable working street with it.
I shoot Canon and I bought this lens after much research looking for a normal prime with a wide aperture that was sharp wide open. I have the 50/1.4, 50/1.8, a bunch of vintage Canon/Takumar/Nikon glass and was not happy with the wide performance of any of them. The Sigma is, quite simply, amazing. If I were to have any complaints it would be that the front lens cap is difficult to attach. This lens quickly became my favorite lens. Sharp wide open, creamy bokeh, very well built.
Then, the Canon 40/2.8 pancake went on sale on the Canon refurb site. With a shipped price under $100 I grabbed one to play with. Holy crap! Small, super sharp. The difference between it and the Sigma are 2 stops, about a pound of glass (maybe more), and $800. IQ is stunning. I'm starting to question my purchase of the Sigma.
I have this lens for a while (35mm 1.4L canon version on 5DMk2). Really good bokeh in a very tight places I used it to shoot boudoir and toddler indoor. Will never sell it nor trade it is a sharp glass for what I need.
PicBack wrote: So, anyone using the new Sigma 35mm F1.4 DG HSM Lens?
I am more interested views from Nikon users (as I am using a D800)... but all views are welcome.
Pretty much my whole port is done with that Art Lens except head shots. It's fantastic is all I can say. I also use a 100mm macro lens and it's just as sharp but you do get richer colors and tones even in low light. I almost never take it off my 5D. It doesn't have IS but I never seemed to need it. It's by far the best lens I own, I really would recommend it for the price.
I also use the D800. I tried out the Sigma over the weekend along side a Nikon 28mm 1.8. Needless to say the Nikon is now in my collection. The Sigma was good. Nice and sharp with all the juicy out OOF parts you would expect. But the Nikon was just way Sharper, hit focus faster without ever searching and the images were much warmer. I actually had went into the shop to check out the Tamron 24-70 that is getting crazy good reviews. I didn't like it at all. I will stick with the 28 and my 50mm lens and use the 'ol feet to do my zooming in and out. The Sharpness of the 28 prime beats all the other lens I own. Even my Nikon 70-200 2.8.