Summary: I had all the 35's on the market even the new sigma A And although the sigma is tad sharper in canter, when viewing images side by side the Canon always pleases my eye the most. Also the bokeh is way more superior on the Canon Not to mention the sigma hunts for focus quite more and is not consistent focusing at different distances even after calibrating on their dock.
Excerpt: I have rented this lens many times in the past, and am very happy to finally own it. It's always in my bag if I'm unsure of how much distance I will have from my subject. It's a great up-close lens without getting too much distortion. Very sharp. Would definitely recommend it.
Pros: Consistent Output, Fast / accurate auto-focus, Strong Construction