The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Otus 100mm F1.4 and the Samyang AF 85mm F1.4 F 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. Zeiss Otus 100mm F1.4 is the longer of the two lenses at 129mm. The Samyang AF 85mm F1.4 F with a length of 75mm, is 54mm shorter. Besides being longer, the Zeiss Otus 100mm F1.4 also has a larger diameter of 101mm compared to the Samyang AF 85mm F1.4 F's 88mm 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 AF 85mm F1.4 F weighs 480g, 65% (925g) lighter than the Zeiss Otus 100mm F1.4's weight of 1405g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Nikon F (FX) Mount for size comparison purposes.
Telephoto Lenses in Nikon F (FX) Mount for Size Comparison
Filter Threads
The Zeiss Otus 100mm F1.4 has a filter size of 86mm whereas the Samyang AF 85mm F1.4 F has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 86mm filters that we recommend you to consider for the Zeiss Otus 100mm F1.4:
And these are the 77mm filters that we recommend for the Samyang AF 85mm F1.4 F:
Lens Mounts
Both the Zeiss Otus 100mm F1.4 and the Samyang AF 85mm F1.4 F has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Zeiss Otus 100mm F1.4 is also available in Canon EF mount.
Focal Range
Zeiss Otus 100mm F1.4 is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
150mm.
On the other hand, the Samyang AF 85mm F1.4 F is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 127.5mm.