Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 85mm F1.4 DG DN is the longer of the two lenses at 94mm. The Samyang 85mm F1.4 with a length of 75mm is 19mm shorter. Besides being longer, the Sigma 85mm F1.4 DG DN also has a larger diameter of 83mm compared to Samyang 85mm F1.4's 78mm 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. Samyang 85mm F1.4 weighs 539g, 14% (91g) lighter than the Sigma 85mm F1.4 DG DN 's weight of 630g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Sony E Mount for size comparison purposes.
Telephoto Prime Lenses in Sony E Mount for Size Comparison
Both Sigma 85mm F1.4 DG DN and Samyang 85mm F1.4 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.
Samyang 85mm F1.4 is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Both lenses have the same focal range of 85mm and the fastest aperture of F1.4.