The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summilux-M 90mm F1.5 ASPH and the Leica Summilux-M 35mm f1.4 ASPH 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. Leica Summilux-M 90mm F1.5 ASPH is the longer of the two lenses at 91mm. The Leica Summilux-M 35mm f1.4 ASPH with a length of 46mm, is 45mm shorter. Besides being longer, the Leica Summilux-M 90mm F1.5 ASPH also has a larger diameter of 74mm compared to the Leica Summilux-M 35mm f1.4 ASPH's 56mm 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 Summilux-M 35mm f1.4 ASPH weighs 320g, 68% (690g) lighter than the Leica Summilux-M 90mm F1.5 ASPH's weight of 1010g.
Filter Threads
The Leica Summilux-M 90mm F1.5 ASPH has a filter size of 67mm whereas the Leica Summilux-M 35mm f1.4 ASPH 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 67mm filters that we recommend you to consider for the Leica Summilux-M 90mm F1.5 ASPH:
And these are the 46mm filters that we recommend for the Leica Summilux-M 35mm f1.4 ASPH:
Lens Mounts
Both the Leica Summilux-M 90mm F1.5 ASPH and the Leica Summilux-M 35mm f1.4 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 Monochrome, Leica M11 and Leica M10.
Focal Range
Leica Summilux-M 90mm F1.5 ASPH is a prime lens with fixed focal lenght of 90mm.
On the other hand, the Leica Summilux-M 35mm f1.4 ASPH is a prime lens with fixed focal lenght of 35mm.