The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 14-42mm F3.5-5.6 EZ and the Panasonic 12-35mm F2.8 OIS 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. Panasonic 12-35mm F2.8 OIS is the longer of the two lenses at 74mm. The Olympus ED 14-42mm F3.5-5.6 EZ with a length of 23mm, is 51mm shorter. Besides being longer, the Panasonic 12-35mm F2.8 OIS also has a larger diameter of 68mm compared to the Olympus ED 14-42mm F3.5-5.6 EZ's 61mm 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. Olympus ED 14-42mm F3.5-5.6 EZ weighs 91g, which means it is 214g (70%) lighter than the Panasonic 12-35mm F2.8 OIS which has a weight of 305g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Micro Four Thirds Mount for size comparison purposes.
Standard Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The Olympus ED 14-42mm F3.5-5.6 EZ has a filter size of 37mm whereas the Panasonic 12-35mm F2.8 OIS has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 37mm filters that we recommend you to consider for the Olympus ED 14-42mm F3.5-5.6 EZ:
And these are the 58mm filters that we recommend for the Panasonic 12-35mm F2.8 OIS:
Lens Mounts
Both the Olympus ED 14-42mm F3.5-5.6 EZ and the Panasonic 12-35mm F2.8 OIS 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
Olympus ED 14-42mm F3.5-5.6 EZ has a focal range of 14-42mm and
3.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
28-84mm when used on a FourThirds format camera.
On the other hand, the Panasonic 12-35mm F2.8 OIS has a focal range of 12-35mm and 2.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 24-70mm when used on a FourThirds format camera.