The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujifilm GF 50mm F3.5 R LM WR 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. Fujifilm GF 50mm F3.5 R LM WR is the longer of the two lenses at 48mm. The Panasonic 20mm F1.7 II ASPH with a length of 26mm, is 22mm shorter. Besides being longer, the Fujifilm GF 50mm F3.5 R LM WR also has a larger diameter of 84mm 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, 74% (248g) lighter than the Fujifilm GF 50mm F3.5 R LM WR's weight of 335g.
Filter Threads
The Fujifilm GF 50mm F3.5 R LM WR has a filter size of 62mm 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 62mm filters that we recommend you to consider for the Fujifilm GF 50mm F3.5 R LM WR:
And these are the 46mm filters that we recommend for the Panasonic 20mm F1.7 II ASPH:
Lens Mounts
The Fujifilm GF 50mm F3.5 R LM WR has the Fujifilm G 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 Fujifilm GFX 100 II, Fujifilm GFX 50S II and Fujifilm GFX 100S for the Fujifilm G Mount and OM System OM-1 II, Panasonic G9 II and OM System OM-5 for the Micro Four Thirds Mount.
Focal Range
Fujifilm GF 50mm F3.5 R LM WR is a prime lens with fixed focal lenght of 50mm.
On the other hand, the Panasonic 20mm F1.7 II ASPH is a prime lens with fixed focal lenght of 20mm which has an effective (full-frame 35mm equivalent) focal range of 40mm when used on a FourThirds format camera.