The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 35mm F1.4 DG DN Art and the Sony FE 40mm F2.5 G 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 35mm F1.4 DG DN Art is the longer of the two lenses at 110mm. The Sony FE 40mm F2.5 G with a length of 45mm, is 65mm shorter. Besides being longer, the Sigma 35mm F1.4 DG DN Art also has a larger diameter of 76mm compared to the Sony FE 40mm F2.5 G's 68mm 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. Sony FE 40mm F2.5 G weighs 173g, 73% (472g) lighter than the Sigma 35mm F1.4 DG DN Art's weight of 645g.
Filter Threads
The Sigma 35mm F1.4 DG DN Art has a filter size of 67mm whereas the Sony FE 40mm F2.5 G has a 49mm 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 Sigma 35mm F1.4 DG DN Art:
And these are the 49mm filters that we recommend for the Sony FE 40mm F2.5 G:
Lens Mounts
Both the Sigma 35mm F1.4 DG DN Art and the Sony FE 40mm F2.5 G has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Sigma 35mm F1.4 DG DN Art is also available in Leica L mount.
Focal Range
Sigma 35mm F1.4 DG DN Art is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
52.5mm.
On the other hand, the Sony FE 40mm F2.5 G 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.