Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 85mm F1.4 DG HSM is the longer of the two lenses at 126mm. The Samyang MF 85mm F1.4 Mk2 with a length of 75mm is 51mm shorter. Besides being longer, the Sigma 85mm F1.4 DG HSM also has a larger diameter of 95mm compared to Samyang MF 85mm F1.4 Mk2'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 MF 85mm F1.4 Mk2 weighs 548g, which means it is 582g (51%) lighter than the Sigma 85mm F1.4 DG HSM which has a weight of 1130g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Canon EF Mount for size comparison purposes.
Telephoto Prime Lenses in Canon EF Mount for Size Comparison
Both Samyang MF 85mm F1.4 Mk2 and Sigma 85mm F1.4 DG HSM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Samyang MF 85mm F1.4 Mk2 is also available in Canon EF-M , Fujifilm X, Micro Four Thirds, Nikon F (FX) and Sony E mounts.
Sigma 85mm F1.4 DG HSM is also available in Sigma SA and Nikon F (FX) mounts.
Both lenses have the same focal range of 85mm and the fastest aperture of F1.4.