The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summilux-M 50mm f1.4 ASPH and the Leica APO 50mm f2 ASPH 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 Summilux-M 50mm f1.4 ASPH is the longer of the two lenses at 53mm. The Leica APO 50mm f2 ASPH with a length of 47mm, is 6mm shorter. Besides being longer, the Leica Summilux-M 50mm f1.4 ASPH also has a larger diameter of 54mm compared to the Leica APO 50mm f2 ASPH'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. Leica APO 50mm f2 ASPH weighs 300g, 10% (35g) lighter than the Leica Summilux-M 50mm f1.4 ASPH's weight of 335g.
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 Leica Summilux-M 50mm f1.4 ASPH and the Leica APO 50mm f2 ASPH 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
Both lenses have the same focal range of 50mm but while Leica Summilux-M 50mm f1.4 ASPH has the fastest aperture of F1.4, the Leica APO 50mm f2 ASPH's widest aperture value is F2.0.