The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 50mm F1.8 and the Sigma 50mm F1.4 DG HSM A for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 50mm F1.4 DG HSM A is the longer of the two lenses at 100mm. The Panasonic S 50mm F1.8 with a length of 82mm is 18mm shorter. Besides being longer, the Sigma 50mm F1.4 DG HSM A also has a larger diameter of 85mm compared to Panasonic S 50mm F1.8's 74mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Panasonic S 50mm F1.8 weighs 300g, which means it is 515g (63%) lighter than the Sigma 50mm F1.4 DG HSM A which has a weight of 815g.
Below you can find the dimension and weight table of the 'Standard Prime Lenses in Leica L Mount for size comparison purposes.
Standard Prime Lenses in Leica L Mount for Size Comparison
Both Panasonic S 50mm F1.8 and Sigma 50mm F1.4 DG HSM A has the same Leica L lens mount. Some of the latest released cameras that are compatible with the Leica L lenses are Sigma fp L, Leica SL2-S and Panasonic S5.
Sigma 50mm F1.4 DG HSM A is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (FX) mounts.