The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang AF 85mm F1.4 FE and the Sony FE 85mm F1.8 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Samyang AF 85mm F1.4 FE is the longer of the two lenses at 100mm. The Sony FE 85mm F1.8 with a length of 82mm is 18mm shorter. Besides being longer, the Samyang AF 85mm F1.4 FE also has a larger diameter of 88mm compared to Sony FE 85mm F1.8'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. Sony FE 85mm F1.8 weighs 371g, 34% (197g) lighter than the Samyang AF 85mm F1.4 FE's weight of 568g.
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 Samyang AF 85mm F1.4 FE and Sony FE 85mm 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 A7R V, Sony FX30 and Sony A7 IV.
Both lenses have the same focal range of 85mm but while Samyang AF 85mm F1.4 FE has the fastest aperture of F1.4, the Sony FE 85mm F1.8's widest aperture value is F1.8.