The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 20mm F1.8 G and the Panasonic 20mm F1.7 II ASPH 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 20mm F1.8 G is the longer of the two lenses at 85mm. The Panasonic 20mm F1.7 II ASPH with a length of 26mm, is 59mm shorter. Besides being longer, the Sony FE 20mm F1.8 G also has a larger diameter of 74mm compared to the Panasonic 20mm F1.7 II ASPH's 63mm 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. Panasonic 20mm F1.7 II ASPH weighs 87g, 76% (286g) lighter than the Sony FE 20mm F1.8 G's weight of 373g.
Filter Threads
The Sony FE 20mm F1.8 G has a filter size of 67mm whereas the Panasonic 20mm F1.7 II ASPH has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Sony FE 20mm F1.8 G:
And these are the 46mm filters that we recommend for the Panasonic 20mm F1.7 II ASPH:
Lens Mounts
The Sony FE 20mm F1.8 G has the Sony E lens mount whereas the Panasonic 20mm F1.7 II ASPH has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A9 III, Sony A7C Mark II and Sony A7CR for the Sony E Mount and OM System OM-1 II, Panasonic G9 II and OM System OM-5 for the Micro Four Thirds Mount.
Focal Range
Both lenses have the same focal range of
20mm but while Sony FE 20mm F1.8 G has the fastest aperture of
F1.8, the Panasonic 20mm F1.7 II ASPH's widest aperture value is
F1.7.