The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 600mm F4 GM OSS and the Zeiss Batis 85mm F1.8 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sony FE 600mm F4 GM OSS is the longer of the two lenses at 449mm. The Zeiss Batis 85mm F1.8 with a length of 78mm, is 371mm shorter. Besides being longer, the Sony FE 600mm F4 GM OSS also has a larger diameter of 164mm compared to the Zeiss Batis 85mm F1.8's 105mm diameter.
The 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. Zeiss Batis 85mm F1.8 weighs 475g, 84% (2565g) lighter than the Sony FE 600mm F4 GM OSS's weight of 3040g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Sony E Mount for size comparison purposes.
Telephoto Prime Lenses in Sony E Mount for Size Comparison
Both the Sony FE 600mm F4 GM OSS and the Zeiss Batis 85mm F1.8 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A7R V, Sony FX30 and Sony A7 IV.
Sony FE 600mm F4 GM OSS is a prime lens with fixed focal lenght of 600mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 900mm.
Zeiss Batis 85mm F1.8 is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 127.5mm.