The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 18mm F1.8 and the Sigma 16mm F1.4 DC DN L 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. Sigma 16mm F1.4 DC DN L is the longer of the two lenses at 92mm. The Panasonic S 18mm F1.8 with a length of 82mm, is 10mm shorter. On the other hand, the Panasonic S 18mm F1.8 has a larger diameter of 74mm compared to the Sigma 16mm F1.4 DC DN L's 72mm diameter.
tt
Below you can find a scaled side-by-side image of Panasonic S 18mm F1.8 and Sigma 16mm F1.4 DC DN L 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. Panasonic S 18mm F1.8 weighs 340g, which means it is 65g (16%) lighter than the Sigma 16mm F1.4 DC DN L which has a weight of 405g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Leica L Mount for size comparison purposes.
Wideangle Lenses in Leica L Mount for Size Comparison
Filter Threads
Both the Panasonic S 18mm F1.8 and the Sigma 16mm F1.4 DC DN L have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Panasonic S 18mm F1.8 and the Sigma 16mm F1.4 DC DN L 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.
Focal Range
Panasonic S 18mm F1.8 is a prime lens with fixed focal lenght of 18mm.
On the other hand, the Sigma 16mm F1.4 DC DN L is a prime lens with fixed focal lenght of 16mm which has an effective (full-frame 35mm equivalent) focal range of 24mm when used on a APS-C / DX format camera.