The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica M 35mm f1.2 and the Voigtlander 21mm F4 Color Skopar II 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. Leica M 35mm f1.2 is the longer of the two lenses at 50mm. The Voigtlander 21mm F4 Color Skopar II with a length of 25mm, is 25mm shorter. Besides being longer, the Leica M 35mm f1.2 also has a larger diameter of 65mm compared to the Voigtlander 21mm F4 Color Skopar II's 55mm 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. Voigtlander 21mm F4 Color Skopar II weighs 136g, 67% (280g) lighter than the Leica M 35mm f1.2's weight of 416g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Leica M Mount for size comparison purposes.
Wideangle Lenses in Leica M Mount for Size Comparison
Filter Threads
The Leica M 35mm f1.2 has a filter size of 49mm whereas the Voigtlander 21mm F4 Color Skopar II has a 39mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 49mm filters that we recommend you to consider for the Leica M 35mm f1.2:
And these are the 39mm filters that we recommend for the Voigtlander 21mm F4 Color Skopar II:
Lens Mounts
Both the Leica M 35mm f1.2 and the Voigtlander 21mm F4 Color Skopar II has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M EV1, Leica M11-D and Pixii Max.
Focal Range
Leica M 35mm f1.2 is a prime lens with fixed focal lenght of 35mm.
On the other hand, the Voigtlander 21mm F4 Color Skopar II is a prime lens with fixed focal lenght of 21mm.