The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica TL 35mm F1.4 ASPH and the Sigma 24mm F1.8 EX DG 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 24mm F1.8 EX DG is the longer of the two lenses at 83mm. The Leica TL 35mm F1.4 ASPH with a length of 77mm is 6mm shorter. Besides being longer, the Sigma 24mm F1.8 EX DG also has a larger diameter of 84mm compared to Leica TL 35mm F1.4 ASPH's 70mm 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. Leica TL 35mm F1.4 ASPH weighs 128g, which means it is 372g (74%) lighter than the Sigma 24mm F1.8 EX DG which has a weight of 500g.
Lens Mounts
Both Leica TL 35mm F1.4 ASPH has the Leica TL lens mount whereas the Sigma 24mm F1.8 EX DG has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are , and for the Leica TL Mount and Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount.
Sigma 24mm F1.8 EX DG is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF, Sony Alpha, Sigma SA, Canon EF, Pentax KAF, Sony Alpha and Nikon F (FX) mounts.
Focal Range
Leica TL 35mm F1.4 ASPH is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of 52.5mm when used on a APS-C / DX format camera. Sigma 24mm F1.8 EX DG is a prime lens with fixed focal lenght of 28mm.