The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 40mm F1.4 DG HSM A and the Sigma 24-70mm F2.8 II 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. Sigma 40mm F1.4 DG HSM A is the longer of the two lenses at 157mm. The Sigma 24-70mm F2.8 II with a length of 122mm, is 35mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 88mm.
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 24-70mm F2.8 II weighs 735g, 41% (525g) lighter than the Sigma 40mm F1.4 DG HSM A's weight of 1260g.
Filter Threads
Both the Sigma 40mm F1.4 DG HSM A and the Sigma 24-70mm F2.8 II have the same Filter thread size of 82mm.
Below are links to the 82mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sigma 40mm F1.4 DG HSM A and the Sigma 24-70mm F2.8 II has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5, Sony A7R VI and Sony A7 V.
Sigma 40mm F1.4 DG HSM A is also available in the Canon EF , Nikon F (FX), Sigma SA and Leica L mounts.
Sigma 24-70mm F2.8 II is also available in Leica L mount.
Focal Range
Sigma 40mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 40mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
60mm.
On the other hand, the Sigma 24-70mm F2.8 II has a focal range of 24-70mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 36 - 105mm.
