The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Noctilux-M 75mm F1.25 ASPH and the Carl Zeiss Sonnar T2/85 ZM 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. Carl Zeiss Sonnar T2/85 ZM is the longer of the two lenses at 100mm. The Leica Noctilux-M 75mm F1.25 ASPH with a length of 91mm, is 9mm shorter. On the other hand, the Leica Noctilux-M 75mm F1.25 ASPH has a larger diameter of 74mm compared to the Carl Zeiss Sonnar T2/85 ZM's 70mm 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. Carl Zeiss Sonnar T2/85 ZM weighs 500g, 52% (555g) lighter than the Leica Noctilux-M 75mm F1.25 ASPH's weight of 1055g.
Filter Threads
The Leica Noctilux-M 75mm F1.25 ASPH has a filter size of 67mm whereas the Carl Zeiss Sonnar T2/85 ZM has a 58mm 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 Noctilux-M 75mm F1.25 ASPH:
And these are the 58mm filters that we recommend for the Carl Zeiss Sonnar T2/85 ZM:
Lens Mounts
Both the Leica Noctilux-M 75mm F1.25 ASPH and the Carl Zeiss Sonnar T2/85 ZM 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 Noctilux-M 75mm F1.25 ASPH is a prime lens with fixed focal lenght of 75mm.
On the other hand, the Carl Zeiss Sonnar T2/85 ZM is a prime lens with fixed focal lenght of 85mm.