The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 16-28mm F2.8 L and the Leica 16-35mm F3.5-4.5 ASPH for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Leica 16-35mm F3.5-4.5 ASPH is the longer of the two lenses at 123mm. The Sigma 16-28mm F2.8 L with a length of 101mm is 22mm shorter. On the other hand, the Sigma 16-28mm F2.8 L has a larger diameter of 77mm compared to Leica 16-35mm F3.5-4.5 ASPH's 61mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sigma 16-28mm F2.8 L weighs 450g, which means it is 540g (54%) lighter than the Leica 16-35mm F3.5-4.5 ASPH which has a weight of 990g.
Both Sigma 16-28mm F2.8 L has the Leica L lens mount whereas the Leica 16-35mm F3.5-4.5 ASPH has the Leica SL lens mount. Some of the latest released cameras that are compatible with these mounts are Sigma fp L, Leica SL2-S and Panasonic S5 for the Leica L Mount and Sigma fp L, Leica SL2-S and Panasonic S5 for the Leica SL Mount.
Sigma 16-28mm F2.8 L has a focal range of 16-28mm and 1.8X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 24 - 42mm.
Leica 16-35mm F3.5-4.5 ASPH has a focal range of 16-35mm and 2.2X zoom ratio .