The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 135mm F1.8 DG HSM and the Carl Zeiss Apo Sonnar T2/135 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Carl Zeiss Apo Sonnar T2/135 is the longer of the two lenses at 128mm. The Sigma 135mm F1.8 DG HSM with a length of 115mm is 13mm shorter. On the other hand, the Sigma 135mm F1.8 DG HSM has a larger diameter of 91mm compared to Carl Zeiss Apo Sonnar T2/135's 84mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Carl Zeiss Apo Sonnar T2/135 weighs 920g, 18% (210g) lighter than the Sigma 135mm F1.8 DG HSM's weight of 1130g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Canon EF Mount for size comparison purposes.
Telephoto Prime Lenses in Canon EF Mount for Size Comparison
Both Sigma 135mm F1.8 DG HSM and Carl Zeiss Apo Sonnar T2/135 has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 135mm F1.8 DG HSM is also available in Sigma SA , Nikon F (FX) and Sony E mounts.
Carl Zeiss Apo Sonnar T2/135 is also available in Nikon F (FX) mount.