The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 40mm F2 SL II and the Pentax 40mm F2.8 L for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Voigtlander 40mm F2 SL II is the longer of the two lenses at 25mm. The Pentax 40mm F2.8 L with a length of 15mm is 10mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 63mm.
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. Pentax 40mm F2.8 L weighs 90g, 55% (110g) lighter than the Voigtlander 40mm F2 SL II's weight of 200g.
Below you can find the dimension and weight table of the 'Standard Prime Lenses in Pentax KAF Mount for size comparison purposes.
Standard Prime Lenses in Pentax KAF Mount for Size Comparison
Both Voigtlander 40mm F2 SL II and Pentax 40mm F2.8 L has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax KF, Pentax K-3 III and Pentax K-1 II.
Voigtlander 40mm F2 SL II is also available in Canon EF and Nikon F (FX) mounts.
Pentax 40mm F2.8 L is also available in Pentax KAF mount.