The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 70-200mm F2.8 G SSM II and the Hartblei 80mm F2.8 IF TS for their suitability to various photography scenarios:
Size and Weight Comparison
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. Hartblei 80mm F2.8 IF TS weighs 850g, 43% (650g) lighter than the Sony 70-200mm F2.8 G SSM II's weight of 1500g.
Filter Threads
The Sony 70-200mm F2.8 G SSM II has a filter size of 77mm whereas the Hartblei 80mm F2.8 IF TS has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sony 70-200mm F2.8 G SSM II:
And these are the 72mm filters that we recommend for the Hartblei 80mm F2.8 IF TS:
Lens Mounts
Both the Sony 70-200mm F2.8 G SSM II and the Hartblei 80mm F2.8 IF TS has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Hartblei 80mm F2.8 IF TS is also available in Canon EF , Pentax KAF and Nikon F (FX) mounts.
Focal Range
Sony 70-200mm F2.8 G SSM II has a focal range of 70-200mm 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
105 - 300mm.
On the other hand, the Hartblei 80mm F2.8 IF TS is a prime lens with fixed focal lenght of 80mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 120mm.