The type of photography that you are planning to use is an important decision factor. Here we have evaluated the OM ED 20mm F1.4 Pro and the Panasonic 20mm F1.7 ASPH 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. OM ED 20mm F1.4 Pro is the longer of the two lenses at 62mm. The Panasonic 20mm F1.7 ASPH with a length of 26mm, is 36mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 63mm.
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. Panasonic 20mm F1.7 ASPH weighs 100g, 59% (147g) lighter than the OM ED 20mm F1.4 Pro's weight of 247g.
Both the OM ED 20mm F1.4 Pro and the Panasonic 20mm F1.7 ASPH has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are OM System OM-5, Panasonic GH6 and OM System OM-1.
Both lenses have the same focal range of 20mm but while OM ED 20mm F1.4 Pro has the fastest aperture of F1.4, the Panasonic 20mm F1.7 ASPH's widest aperture value is F1.7.