The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Otus 85mm F1.4 and the Voigtlander 90mm F3.5 SL II for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Zeiss Otus 85mm F1.4 is the longer of the two lenses at 138mm. The Voigtlander 90mm F3.5 SL II with a length of 52mm is 86mm shorter. Besides being longer, the Zeiss Otus 85mm F1.4 also has a larger diameter of 101mm compared to Voigtlander 90mm F3.5 SL II's 63mm 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. Voigtlander 90mm F3.5 SL II weighs 320g, 73% (880g) lighter than the Zeiss Otus 85mm F1.4's weight of 1200g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Canon EF Mount for size comparison purposes.
Telephoto Prime Lenses in Canon EF Mount for Size Comparison
Lens Mounts
Both Zeiss Otus 85mm F1.4 and Voigtlander 90mm F3.5 SL II has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Zeiss Otus 85mm F1.4 is also available in Nikon F (FX) mount.
Voigtlander 90mm F3.5 SL II is also available in Nikon F (FX) and Pentax KAF mounts.
Focal Range
Zeiss Otus 85mm F1.4 is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 136mm.
Voigtlander 90mm F3.5 SL II is a prime lens with fixed focal lenght of 90mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 144mm.