The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 40mm F1.4 Nokton Classic and the Leica Summicron-M 50mm f2 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Leica Summicron-M 50mm f2 is the longer of the two lenses at 44mm. The Voigtlander 40mm F1.4 Nokton Classic with a length of 30mm, is 14mm shorter. On the other hand, the Voigtlander 40mm F1.4 Nokton Classic has a larger diameter of 55mm compared to the Leica Summicron-M 50mm f2's 53mm diameter.
The 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 40mm F1.4 Nokton Classic weighs 175g, which means it is 65g (27%) lighter than the Leica Summicron-M 50mm f2 which has a weight of 240g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Leica M Mount for size comparison purposes.
Standard Prime Lenses in Leica M Mount for Size Comparison
Lens Mounts
Both the Voigtlander 40mm F1.4 Nokton Classic and the Leica Summicron-M 50mm f2 has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M11, Leica M10 and Leica M Typ 262.
Focal Range
Voigtlander 40mm F1.4 Nokton Classic is a prime lens with fixed focal lenght of 40mm. Leica Summicron-M 50mm f2 is a prime lens with fixed focal lenght of 50mm.