The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 135mm F1.4 and the Sony FE 28-70mm F2.0 GM 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 Sigma 135mm F1.4 with a length of 136mm, is 4mm shorter. On the other hand, the Sigma 135mm F1.4 has a larger diameter of 112mm compared to the Sony FE 28-70mm F2.0 GM's 93mm diameter.
Below you can find a scaled side-by-side image of Sigma 135mm F1.4 and Sony FE 28-70mm F2.0 GM to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 135mm F1.4 and the Sony FE 28-70mm F2.0 GM Size and Weight 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 28-70mm F2.0 GM weighs 918g, 35% (512g) lighter than the Sigma 135mm F1.4's weight of 1430g.
Filter Threads
The Sigma 135mm F1.4 has a filter size of 105mm whereas the Sony FE 28-70mm F2.0 GM has a 86mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 105mm filters that we recommend you to consider for the Sigma 135mm F1.4:
And these are the 86mm filters that we recommend for the Sony FE 28-70mm F2.0 GM:
Lens Mounts
The Sigma 135mm F1.4 has the Leica L lens mount whereas the Sony FE 28-70mm F2.0 GM has the Sony E lens mount . Some of the latest released cameras that are compatible with these mounts are Leica SL3-P , Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount.
Focal Range
Sigma 135mm F1.4 is a prime lens with fixed focal lenght of 135mm.
On the other hand, the 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 .
