The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic 25mm F1.4 II ASPH and the Olympus 17mm F1.2 Pro 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. Olympus 17mm F1.2 Pro is the longer of the two lenses at 87mm. The Panasonic 25mm F1.4 II ASPH with a length of 55mm, is 32mm shorter. Besides being longer, the Olympus 17mm F1.2 Pro also has a larger diameter of 68mm compared to the Panasonic 25mm F1.4 II ASPH's 63mm diameter.
tt
Below you can find a scaled side-by-side image of Panasonic 25mm F1.4 II ASPH and Olympus 17mm F1.2 Pro to get a better idea of how their sizes compare in real life.
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 25mm F1.4 II ASPH weighs 205g, which means it is 185g (47%) lighter than the Olympus 17mm F1.2 Pro which has a weight of 390g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Wideangle Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The Panasonic 25mm F1.4 II ASPH has a filter size of 46mm whereas the Olympus 17mm F1.2 Pro has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 46mm filters that we recommend you to consider for the Panasonic 25mm F1.4 II ASPH:
And these are the 62mm filters that we recommend for the Olympus 17mm F1.2 Pro:
Lens Mounts
Both the Panasonic 25mm F1.4 II ASPH and the Olympus 17mm F1.2 Pro 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-1 II, Panasonic G9 II and OM System OM-5.
Focal Range
Panasonic 25mm F1.4 II ASPH is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of
50mm when used on a FourThirds format camera.
On the other hand, the Olympus 17mm F1.2 Pro is a prime lens with fixed focal lenght of 17mm which has an effective (full-frame 35mm equivalent) focal range of 34mm when used on a FourThirds format camera.