The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 14-28mm F4-5.6 and the Sigma 20mm F2 DG 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. Panasonic S 14-28mm F4-5.6 is the longer of the two lenses at 90mm. The Sigma 20mm F2 DG DN C with a length of 72mm, is 18mm shorter. Besides being longer, the Panasonic S 14-28mm F4-5.6 also has a larger diameter of 84mm compared to the Sigma 20mm F2 DG DN C's 70mm diameter.
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Below you can find a scaled side-by-side image of Panasonic S 14-28mm F4-5.6 and Sigma 20mm F2 DG 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. Panasonic S 14-28mm F4-5.6 weighs 345g, which means it is 25g (6%) lighter than the Sigma 20mm F2 DG DN C which has a weight of 370g.
Filter Threads
The Panasonic S 14-28mm F4-5.6 has a filter size of 77mm whereas the Sigma 20mm F2 DG DN C has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Panasonic S 14-28mm F4-5.6:
And these are the 62mm filters that we recommend for the Sigma 20mm F2 DG DN C:
Lens Mounts
Both the Panasonic S 14-28mm F4-5.6 and the Sigma 20mm F2 DG 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 20mm F2 DG DN C is also available in Sony E mount.
Focal Range
Panasonic S 14-28mm F4-5.6 has a focal range of 14-28mm and
2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
21 - 42mm.
On the other hand, the Sigma 20mm F2 DG DN C is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 30mm.