Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sony FE 35mm F1.8 is the longer of the two lenses at 73mm. The Sigma 35mm F2 DG DN with a length of 65mm is 8mm shorter. On the other hand, the Sigma 35mm F2 DG DN has a larger diameter of 70mm compared to Sony FE 35mm F1.8's 66mm diameter.
Below you can find the scaled side by side image of Sigma 35mm F2 DG DN and Sony FE 35mm F1.8 to get a better idea of how their size compare in real life.
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 35mm F1.8 weighs 280g, 13% (45g) lighter than the Sigma 35mm F2 DG DN's weight of 325g.
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 35mm F2 DG DN and Sony FE 35mm F1.8 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 A7 IV and Sony ZV-E10.
Sigma 35mm F2 DG DN is also available in Leica L mount.