The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica APO-Summicron-M 35mm F2 ASPH and the Voigtlander 28mm F2 Ultron 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 28mm F2 Ultron is the longer of the two lenses at 51mm. The Leica APO-Summicron-M 35mm F2 ASPH with a length of 41mm, is 10mm shorter. Besides being longer, the Voigtlander 28mm F2 Ultron also has a larger diameter of 55mm compared to the Leica APO-Summicron-M 35mm F2 ASPH's 53mm 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 28mm F2 Ultron weighs 244g, 23% (76g) lighter than the Leica APO-Summicron-M 35mm F2 ASPH's weight of 320g.
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 APO-Summicron-M 35mm F2 ASPH has a filter size of 39mm whereas the Voigtlander 28mm F2 Ultron has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 39mm filters that we recommend you to consider for the Leica APO-Summicron-M 35mm F2 ASPH:
And these are the 46mm filters that we recommend for the Voigtlander 28mm F2 Ultron:
Lens Mounts
Both the Leica APO-Summicron-M 35mm F2 ASPH and the Voigtlander 28mm F2 Ultron 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
Leica APO-Summicron-M 35mm F2 ASPH is a prime lens with fixed focal lenght of 35mm.
On the other hand, the Voigtlander 28mm F2 Ultron is a prime lens with fixed focal lenght of 28mm.