The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujifilm XF 27mm F2.8 R WR and the Leica Summicron-T 23mm f2 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 Summicron-T 23mm f2 ASPH is the longer of the two lenses at 37mm. The Fujifilm XF 27mm F2.8 R WR with a length of 23mm, is 14mm shorter. Besides being longer, the Leica Summicron-T 23mm f2 ASPH also has a larger diameter of 63mm compared to the Fujifilm XF 27mm F2.8 R WR's 62mm 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. Fujifilm XF 27mm F2.8 R WR weighs 84g, which means it is 70g (45%) lighter than the Leica Summicron-T 23mm f2 ASPH which has a weight of 154g.
Filter Threads
The Fujifilm XF 27mm F2.8 R WR has a filter size of 39mm whereas the Leica Summicron-T 23mm f2 ASPH has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 39mm filters that we recommend you to consider for the Fujifilm XF 27mm F2.8 R WR:
And these are the 52mm filters that we recommend for the Leica Summicron-T 23mm f2 ASPH:
Lens Mounts
The Fujifilm XF 27mm F2.8 R WR has the Fujifilm X lens mount whereas the Leica Summicron-T 23mm f2 ASPH has the Leica T lens mount. Some of the latest released cameras that are compatible with these mounts are Fujifilm X-S20, Fujifilm X-T5 and Fujifilm X-H2 for the Fujifilm X Mount and , and for the Leica T Mount.
Focal Range
Fujifilm XF 27mm F2.8 R WR is a prime lens with fixed focal lenght of 27mm which has an effective (full-frame 35mm equivalent) focal range of
40.5mm when used on a APS-C / DX format camera.
On the other hand, the Leica Summicron-T 23mm f2 ASPH is a prime lens with fixed focal lenght of 23mm which has an effective (full-frame 35mm equivalent) focal range of 34.5mm when used on a APS-C / DX format camera.