The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 50mm F1.4 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. Sigma 50mm F1.4 DG HSM A is the longer of the two lenses at 100mm. The Sony 50mm F1.4 with a length of 43mm, is 57mm shorter. Besides being longer, the Sigma 50mm F1.4 DG HSM A also has a larger diameter of 85mm compared to the Sony 50mm F1.4's 66mm 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 50mm F1.4 weighs 222g, which means it is 593g (72%) lighter than the Sigma 50mm F1.4 DG HSM A which has a weight of 815g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Sony Alpha Mount for size comparison purposes.
Standard Prime Lenses in Sony Alpha Mount for Size Comparison
Lens Mounts
Both the Sony 50mm F1.4 and the Sigma 50mm F1.4 DG HSM A has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Sigma 50mm F1.4 DG HSM A is also available in Canon EF , Sigma SA, Nikon F (FX) and Leica L mounts.
Focal Range
Both lenses have the same focal range of 50mm and the fastest aperture of F1.4.