I personally own the Sigma as well, and yeah it's an alright option, especially now that it's dropping in price (I picked mine up for 215) and if you get a good copy, you'll be stoked. Especially if you want some pretty nice bokeh - though your subject won't be particularly sharp - especially below f2.8.
I just really like that for Nikon, the 35 f1.8 is about 175 used, is very much still fast, and works on a full frame without a hitch. The Sigma is good, no doubt, but the Nikon is an incredible deal... and is about 100$ less than the Canon 35f2, which is made worse, and is slower.
Have a nice day, Bluename.