The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 30mm F1.4 C and the Leica TL 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 TL 35mm F1.4 ASPH is the longer of the two lenses at 77mm. The Sigma 30mm F1.4 C with a length of 73mm, is 4mm shorter. Besides being longer, the Leica TL 35mm F1.4 ASPH also has a larger diameter of 70mm compared to the Sigma 30mm F1.4 C's 65mm diameter.
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Below you can find a scaled side-by-side image of Sigma 30mm F1.4 C and Leica TL 35mm F1.4 ASPH to get a better idea of how their sizes compare in real life.
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 TL 35mm F1.4 ASPH weighs 128g, 51% (137g) lighter than the Sigma 30mm F1.4 C's weight of 265g.
Filter Threads
The Sigma 30mm F1.4 C has a filter size of 52mm whereas the Leica TL 35mm F1.4 ASPH has a 60mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Sigma 30mm F1.4 C:
And these are the 60mm filters that we recommend for the Leica TL 35mm F1.4 ASPH:
Lens Mounts
The Sigma 30mm F1.4 C has the Fujifilm X lens mount whereas the Leica TL 35mm F1.4 ASPH has the Leica TL 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 TL Mount.
Sigma 30mm F1.4 C is also available in Sony E , Micro Four Thirds and Nikon Z mounts.
Focal Range
Sigma 30mm F1.4 C is a prime lens with fixed focal lenght of 30mm which has an effective (full-frame 35mm equivalent) focal range of
45mm when used on a APS-C / DX format camera.
On the other hand, the Leica TL 35mm F1.4 ASPH is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of 52.5mm when used on a APS-C / DX format camera.