Buy the Sigma 35mm f/1.2 lens: http://SDP.io/S35f12 Buy the Sony 35mm f/1.4 GM lens: http://SDP.io/S35GM Sign-up for Tony's Workshops: http://SDP.io/WS The Sigma 35 mm f/1.2 ART is a monster of a lens — massive aperture, tank-like build, and incredible low-light performance. But is it really better...