The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 85mm F1.4 GM and the Samyang 85mm F1.4 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sony FE 85mm F1.4 GM is the longer of the two lenses at 108mm. The Samyang 85mm F1.4 with a length of 75mm is 33mm shorter. Besides being longer, the Sony FE 85mm F1.4 GM also has a larger diameter of 90mm 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, 34% (281g) lighter than the Sony FE 85mm F1.4 GM's weight of 820g.
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 Sony FE 85mm F1.4 GM 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 A7R V, Sony FX30 and Sony A7 IV.
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.