The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 28-70mm F2.0 GM and the Zeiss Batis 40mm F2 CF 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. Sony FE 28-70mm F2.0 GM is the longer of the two lenses at 140mm. The Zeiss Batis 40mm F2 CF with a length of 93mm, is 47mm shorter. Besides being longer, the Sony FE 28-70mm F2.0 GM also has a larger diameter of 93mm compared to the Zeiss Batis 40mm F2 CF's 91mm 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. Zeiss Batis 40mm F2 CF weighs 361g, 60% (557g) lighter than the Sony FE 28-70mm F2.0 GM's weight of 918g.
Filter Threads
The Sony FE 28-70mm F2.0 GM has a filter size of 86mm whereas the Zeiss Batis 40mm F2 CF has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 86mm filters that we recommend you to consider for the Sony FE 28-70mm F2.0 GM:
And these are the 67mm filters that we recommend for the Zeiss Batis 40mm F2 CF:
Lens Mounts
Both the Sony FE 28-70mm F2.0 GM and the Zeiss Batis 40mm F2 CF 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.
Focal Range
Sony FE 28-70mm F2.0 GM has a focal range of 28-70mm and
2.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 105mm.
On the other hand, the Zeiss Batis 40mm F2 CF 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.
