The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tokina atx-m 23mm F1.4 E and the Sigma 19mm F2.8 DN for their suitability to various photography scenarios:
Size and Weight Comparison
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. Sigma 19mm F2.8 DN weighs 140g, 49% (136g) lighter than the Tokina atx-m 23mm F1.4 E's weight of 276g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Wideangle Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both the Tokina atx-m 23mm F1.4 E and the Sigma 19mm F2.8 DN has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A6700, Sony FX30 and Sony ZV-E10.
Sigma 19mm F2.8 DN is also available in Micro Four Thirds mount.
Focal Range
Tokina atx-m 23mm F1.4 E is a prime lens with fixed focal lenght of 23mm which has an effective (full-frame 35mm equivalent) focal range of
34.5mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 19mm F2.8 DN is a prime lens with fixed focal lenght of 19mm which has an effective (full-frame 35mm equivalent) focal range of 28.5mm when used on a APS-C / DX format camera.