I had been contemplating a 35mm fast aperture lens for quite some time and being a Nikon owner I looked hard at the
Nikon 35 1.4 as an option, but Nikon's over priced lens put me off from making that purchase.
One year Later!
I do use other third party lens and for the most part at the end of the day they work very good. Hearing Sigma was about to release a new line of lens that raised the bar on 3rd party lens, I waited to see what Sigma would do. Sure enough Sigma offered a new 35mm 1.4 with a hyper sonic motor in it’s newly established art (A) category. Sigma announced recently three new lines of lens; Contemporary (C), Art (A), and Sport (S)