The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 85mm F1.4 DG DN and the Sony FE 135mm F1.8 GM 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 135mm F1.8 GM is the longer of the two lenses at 127mm. The Sigma 85mm F1.4 DG DN with a length of 94mm, is 33mm shorter. Besides being longer, the Sony FE 135mm F1.8 GM also has a larger diameter of 90mm compared to the Sigma 85mm F1.4 DG DN 's 83mm diameter.
Below you can find a scaled side-by-side image of Sigma 85mm F1.4 DG DN and Sony FE 135mm F1.8 GM to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 85mm F1.4 DG DN and the Sony FE 135mm F1.8 GM 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. Sigma 85mm F1.4 DG DN weighs 630g, which means it is 320g (33%) lighter than the Sony FE 135mm F1.8 GM which has a weight of 950g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Sony E Mount for size comparison purposes.
Telephoto Prime Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Sigma 85mm F1.4 DG DN and the Sony FE 135mm F1.8 GM 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.
Focal Range
Sigma 85mm F1.4 DG DN is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 127.5mm.
Sony FE 135mm F1.8 GM is a prime lens with fixed focal lenght of 135mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 202.5mm.