The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 35mm F1.4 GM and the Samyang AF 18mm F2.8 FE 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 35mm F1.4 GM is the longer of the two lenses at 96mm. The Samyang AF 18mm F2.8 FE with a length of 61mm is 35mm shorter. Besides being longer, the Sony FE 35mm F1.4 GM also has a larger diameter of 76mm compared to Samyang AF 18mm F2.8 FE's 64mm 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 AF 18mm F2.8 FE weighs 145g, 72% (379g) lighter than the Sony FE 35mm F1.4 GM's weight of 524g.
Below you can find the dimension and weight table of the 'Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Wideangle Prime Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both Sony FE 35mm F1.4 GM and Samyang AF 18mm F2.8 FE 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.
Focal Range
Sony FE 35mm F1.4 GM is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 52.5mm.
Samyang AF 18mm F2.8 FE is a prime lens with fixed focal lenght of 18mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 27mm.