Sigma has been crashing the competition with its Global vision line up. Combination of no compromise image quality and fair price is creating havoc in Canon and Nikon tents. And the recent launch of Sony E mount lenses will surely disturb Sony’s first party glass business. (will also drive Sony’s mirrorless business by providing true 3rd party lens support). In 2013 I bought my first prime lens Sigma 35 f/1.4 art till this day it never leaves my camera bag. Since then I have added Sigma’s 85 f/1.4 and 135 f/1.8 into my arsenal.