The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 50mm F1.2 AS UMC CS and the Samyang MF 85mm F1.4 Mk2 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Samyang MF 85mm F1.4 Mk2 is the longer of the two lenses at 75mm. The Samyang 50mm F1.2 AS UMC CS with a length of 74mm, is 1mm shorter. Besides being longer, the Samyang MF 85mm F1.4 Mk2 also has a larger diameter of 78mm compared to the Samyang 50mm F1.2 AS UMC CS's 68mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Samyang 50mm F1.2 AS UMC CS weighs 375g, which means it is 173g (31%) lighter than the Samyang MF 85mm F1.4 Mk2 which has a weight of 548g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Fujifilm X Mount for size comparison purposes.
Telephoto Lenses in Fujifilm X Mount for Size Comparison
Filter Threads
The Samyang 50mm F1.2 AS UMC CS has a filter size of 62mm whereas the Samyang MF 85mm F1.4 Mk2 has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Samyang 50mm F1.2 AS UMC CS:
And these are the 72mm filters that we recommend for the Samyang MF 85mm F1.4 Mk2:
Lens Mounts
Both the Samyang 50mm F1.2 AS UMC CS and the Samyang MF 85mm F1.4 Mk2 has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-S20, Fujifilm X-T5 and Fujifilm X-H2.
Samyang 50mm F1.2 AS UMC CS is also available in Canon EF-M , Micro Four Thirds and Sony E mounts.
Samyang MF 85mm F1.4 Mk2 is also available in Canon EF , Canon EF-M, Micro Four Thirds, Nikon F (FX) and Sony E mounts.
Focal Range
Samyang 50mm F1.2 AS UMC CS is a prime lens with fixed focal lenght of 50mm which has an effective (full-frame 35mm equivalent) focal range of
75mm when used on a APS-C / DX format camera.
On the other hand, the Samyang MF 85mm F1.4 Mk2 is a prime lens with fixed focal lenght of 85mm.