The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24mm F2 DG DN C and the Sony E 20mm F2.8 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 24mm F2 DG DN C is the longer of the two lenses at 72mm. The Sony E 20mm F2.8 with a length of 20mm is 52mm shorter. Besides being longer, the Sigma 24mm F2 DG DN C also has a larger diameter of 70mm compared to Sony E 20mm F2.8's 63mm 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 E 20mm F2.8 weighs 69g, 81% (296g) lighter than the Sigma 24mm F2 DG DN C's weight of 365g.
Below you can find the dimension and weight table of the 'Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Wideangle Prime Lenses in Sony E Mount for Size Comparison
Both Sigma 24mm F2 DG DN C and Sony E 20mm F2.8 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX30, Sony ZV-E10 and Sony A6600.
Sigma 24mm F2 DG DN C is also available in Leica L mount.
Sigma 24mm F2 DG DN C is a prime lens with fixed focal lenght of 24mm which has an effective (full-frame 35mm equivalent) focal range of 36mm when used on a 35mm FF format camera. Sony E 20mm F2.8 is a prime lens with fixed focal lenght of 20mm which has an effective (full-frame 35mm equivalent) focal range of 30mm when used on a APS-C / DX format camera.