The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 56mm F1.4 C and the Carl Zeiss Touit 1.8/32 for their suitability to various photography scenarios:
Size and Weight Comparison
The 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. Carl Zeiss Touit 1.8/32 weighs 210g, 25% (70g) lighter than the Sigma 56mm F1.4 C's weight of 280g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Fujifilm X Mount for size comparison purposes.
Standard Prime Lenses in Fujifilm X Mount for Size Comparison
Lens Mounts
Both the Sigma 56mm F1.4 C and the Carl Zeiss Touit 1.8/32 has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T5, Fujifilm X-H2 and Fujifilm X-H2S.
Carl Zeiss Touit 1.8/32 is also available in Sony E mount.
Focal Range
Sigma 56mm F1.4 C is a prime lens with fixed focal lenght of 56mm which has an effective (full-frame 35mm equivalent) focal range of 84mm when used on a APS-C / DX format camera. Carl Zeiss Touit 1.8/32 is a prime lens with fixed focal lenght of 32mm which has an effective (full-frame 35mm equivalent) focal range of 48mm when used on a APS-C / DX format camera.