The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 35mm F1.8 and the Sigma 30mm F1.4 EX DC HSM 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 35mm F1.8 is the longer of the two lenses at 82mm. The Sigma 30mm F1.4 EX DC HSM with a length of 59mm, is 23mm shorter. On the other hand, the Sigma 30mm F1.4 EX DC HSM has a larger diameter of 77mm compared to the Panasonic S 35mm F1.8's 74mm diameter.
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 35mm F1.8 weighs 295g, which means it is 135g (31%) lighter than the Sigma 30mm F1.4 EX DC HSM which has a weight of 430g.
Filter Threads
The Panasonic S 35mm F1.8 has a filter size of 67mm whereas the Sigma 30mm F1.4 EX DC HSM 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 67mm filters that we recommend you to consider for the Panasonic S 35mm F1.8:
And these are the 62mm filters that we recommend for the Sigma 30mm F1.4 EX DC HSM:
Lens Mounts
The Panasonic S 35mm F1.8 has the Leica L lens mount whereas the Sigma 30mm F1.4 EX DC HSM has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Sigma SD1 Merrill, Sigma SD1 and for the Sigma SA Mount.
Sigma 30mm F1.4 EX DC HSM is also available in Canon EF-S , Nikon F (DX), Four Thirds, Pentax KAF and Sony Alpha mounts.
Focal Range
Panasonic S 35mm F1.8 is a prime lens with fixed focal lenght of 35mm.
On the other hand, the Sigma 30mm F1.4 EX DC HSM 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.
