The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica SL 24-70mm F2.8 and the Sigma 18-50mm F2.8 DC DN C 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 SL 24-70mm F2.8 is the longer of the two lenses at 123mm. The Sigma 18-50mm F2.8 DC DN C with a length of 75mm, is 48mm shorter. Besides being longer, the Leica SL 24-70mm F2.8 also has a larger diameter of 88mm compared to the Sigma 18-50mm F2.8 DC DN C's 65mm diameter.
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Below you can find a scaled side-by-side image of Leica SL 24-70mm F2.8 and Sigma 18-50mm F2.8 DC DN C 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. Sigma 18-50mm F2.8 DC DN C weighs 290g, 66% (566g) lighter than the Leica SL 24-70mm F2.8's weight of 856g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Leica L Mount for size comparison purposes.
Standard Lenses in Leica L Mount for Size Comparison
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Filter Threads
The Leica SL 24-70mm F2.8 has a filter size of 82mm whereas the Sigma 18-50mm F2.8 DC DN C has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 82mm filters that we recommend you to consider for the Leica SL 24-70mm F2.8:
And these are the 55mm filters that we recommend for the Sigma 18-50mm F2.8 DC DN C:
Lens Mounts
Both the Leica SL 24-70mm F2.8 and the Sigma 18-50mm F2.8 DC DN C has the same Leica L lens mount. Some of the latest released cameras that are compatible with the Leica L lenses are Leica SL3, Panasonic S5 II and Panasonic S5 II X.
Sigma 18-50mm F2.8 DC DN C is also available in Sony E and Fujifilm X mounts.
Focal Range
Leica SL 24-70mm F2.8 has a focal range of 24-70mm and
2.9X zoom ratio .
On the other hand, the Sigma 18-50mm F2.8 DC DN C has a focal range of 18-50mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-75mm when used on a APS-C / DX format camera.