The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 35mm F1.2 Nokton and the Leica Summaron-M 28mm F5.6 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. Voigtlander 35mm F1.2 Nokton is the longer of the two lenses at 78mm. The Leica Summaron-M 28mm F5.6 with a length of 18mm, is 60mm shorter. Besides being longer, the Voigtlander 35mm F1.2 Nokton also has a larger diameter of 63mm compared to the Leica Summaron-M 28mm F5.6's 51mm 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. Leica Summaron-M 28mm F5.6 weighs 165g, 66% (325g) lighter than the Voigtlander 35mm F1.2 Nokton's weight of 490g.
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 Voigtlander 35mm F1.2 Nokton has a filter size of 52mm whereas the Leica Summaron-M 28mm F5.6 has a 34mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Voigtlander 35mm F1.2 Nokton:
And these are the 34mm filters that we recommend for the Leica Summaron-M 28mm F5.6:
Lens Mounts
Both the Voigtlander 35mm F1.2 Nokton and the Leica Summaron-M 28mm F5.6 has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M11 Monochrome, Leica M11 and Leica M10.
Focal Range
Voigtlander 35mm F1.2 Nokton is a prime lens with fixed focal lenght of 35mm.
On the other hand, the Leica Summaron-M 28mm F5.6 is a prime lens with fixed focal lenght of 28mm.