The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 50mm F2.5 G and the Sigma 56mm F1.4 DC DN C for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 56mm F1.4 DC DN C is the longer of the two lenses at 60mm. The Sony FE 50mm F2.5 G with a length of 45mm is 15mm shorter. On the other hand, the Sony FE 50mm F2.5 G has a larger diameter of 68mm compared to Sigma 56mm F1.4 DC DN C's 67mm 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. Sony FE 50mm F2.5 G weighs 174g, which means it is 106g (37%) lighter than the Sigma 56mm F1.4 DC DN C which has a weight of 280g.
Below you can find the dimension and weight table of the 'Standard Prime Lenses in Sony E Mount for size comparison purposes.
Standard Prime Lenses in Sony E Mount for Size Comparison
Both Sony FE 50mm F2.5 G and Sigma 56mm F1.4 DC DN C has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A7R V, Sony FX30 and Sony A7 IV.
Sigma 56mm F1.4 DC DN C is also available in Micro Four Thirds and Leica L mounts.
Sony FE 50mm F2.5 G is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 75mm.
Sigma 56mm F1.4 DC DN C is a prime lens with fixed focal lenght of 56mm which has a 35mm equivalent focal range of 75mm when used on a APS-C / DX format camera.