The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 50mm F1.2 GM and the Sigma 50mm F1.4 DG HSM A 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 50mm F1.2 GM is the longer of the two lenses at 108mm. The Sigma 50mm F1.4 DG HSM A with a length of 100mm, is 8mm shorter. Besides being longer, the Sony FE 50mm F1.2 GM also has a larger diameter of 87mm compared to the Sigma 50mm F1.4 DG HSM A's 85mm diameter.
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 50mm F1.2 GM weighs 778g, which means it is 37g (4%) lighter than the Sigma 50mm F1.4 DG HSM A which has a weight of 815g.
Lens Mounts
The Sony FE 50mm F1.2 GM has the Sony E lens mount whereas the Sigma 50mm F1.4 DG HSM A has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E1, Sony A7R V and Sony FX30 for the Sony E Mount and Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount.
Sigma 50mm F1.4 DG HSM A is also available in Canon EF , Sony Alpha, Nikon F (FX) and Leica L mounts.
Focal Range
Both lenses have the same focal range of 50mm but while Sony FE 50mm F1.2 GM has the fastest aperture of F1.2, the Sigma 50mm F1.4 DG HSM A's widest aperture value is F1.4.