The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 70-200mm F2.8 GM II and the Sigma 100-400mm F5-6.3 OS for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sony FE 70-200mm F2.8 GM II is the longer of the two lenses at 200mm. The Sigma 100-400mm F5-6.3 OS with a length of 197mm, is 3mm shorter. Besides being longer, the Sony FE 70-200mm F2.8 GM II also has a larger diameter of 88mm compared to the Sigma 100-400mm F5-6.3 OS's 86mm diameter.
Below you can find a scaled side-by-side image of Sony FE 70-200mm F2.8 GM II and Sigma 100-400mm F5-6.3 OS to get a better idea of how their sizes compare in real life.
Comparison image of the Sony FE 70-200mm F2.8 GM II and the Sigma 100-400mm F5-6.3 OS Size and Weight The 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. Sony FE 70-200mm F2.8 GM II weighs 1045g, which means it is 90g (7%) lighter than the Sigma 100-400mm F5-6.3 OS which has a weight of 1135g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Sony E Mount for size comparison purposes.
Telephoto Zoom Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Sony FE 70-200mm F2.8 GM II and the Sigma 100-400mm F5-6.3 OS has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony ZV-E1, Sony A7R V and Sony FX30.
Sigma 100-400mm F5-6.3 OS is also available in Leica L mount.
Focal Range
Sony FE 70-200mm F2.8 GM II has a focal range of 70-200mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105 - 300mm.
Sigma 100-400mm F5-6.3 OS has a focal range of 100-400mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 150 - 600mm.