Focal Length and Versatility
The Canon RF 100-400mm offers incredible reach for wildlife, sports, and distant subjects with 4x zoom range. The Sigma 35mm F1.4 excels at wide-angle photography, portraits, and low-light situations. These lenses serve entirely different photographic purposes - telephoto zoom versus wide-angle prime.
Image Quality and Performance
The Sigma 35mm F1.4 delivers exceptional sharpness and beautiful bokeh with its fast aperture, ideal for professional portraits and artistic work. The Canon 100-400mm provides solid image quality throughout its zoom range with effective image stabilization, though the variable f/5.6-8 aperture limits low-light performance compared to the Sigma's constant f/1.4.
Build Quality and Features
Both lenses feature weather sealing and robust construction. The Canon includes 5.5-stop image stabilization and fast USM autofocus motor. The Sigma offers premium Art series build quality with excellent optical design. The Canon's zoom flexibility contrasts with the Sigma's prime lens precision and speed.
