Summary: though the lens is an excellent performer, that fact that it's f4.0 is it's real limitation. you loose two stops of light compared to it's matched longer lens, the 14-35mm f2.0, and this makes a huge difference when the light is low. Why have a physically large lens, slightly smaller than a comparable fx sensor lens, that's a full stop slower? makes no sense. oly can't compete on high iso and even marketed that 4/3rds lenses are either smaller or faster.
Olympus 7-14mm f/4 Zuiko Digital review by MartinM
18 October 2012
Summary: I have tested several wide angel lenses Sony Zeiss 16-35 Canon EF 16-35 II Canon EF 17-40 and among these, the Zuiko is the best lens, followed by the Zeiss. Canon has really no wide angle that has usable corners nor an acceptable sharpness wide open. This is really a very nice lens and it does almost not have a disortion at the wide end. Wide open, very far corners become a bit softer. But nothing really I could complain of. Paired with my 14-35, this is THE combo.
Pros: Wide, excellent IQ, almsot without disortion
Awesome lens, very expensive, but worth every single penny
8 October 2012
Summary: This is an awesome lens: the pictures are sharp, the colours vivid, the contrast excellent, the vignetting minimal (no small feat for an ultra-wide-angle lens). I use a Leica Vario-Elmarit 14-50 as a standard lens, which is still a bit sharper. But the Olympus 7-14 is by far the best wide-angle lens I have ever had, and it is exhilarating to work with.
Excellent wide angle zoom lens for 4/3 format DSLR's
1 February 2012
Summary: The Olympus Zuiko Digital ED 7mm - 14 mm F/4.o Lens is a member of the best quality lenses that Olympus makes for their 4/3 format E series DSLR cameras. It is a nearly perfect lens that zooms from extreme wide angle to moderate wide angle with no vignetting or unusual image distortion other the distortion that is characteristic of all wide angle lenses. It is f/4.0 throughout its zoom range. It focuses very fast.
Summary: A 14-28mm equivalent, this is one sweet lens! Now I can stop being concerned about "not wide enough" and frankly, it's so sharp that I stopped thinking about stitching panoramas together. Olympus glass is really great stuff!
Summary: Love this lens! The clarity is amazing and like one of the other reviewers said, it is tough to go back to my standard lenses after using this one. The lens is heavy and can put quite a strain on the neck. It is great for capturing crazy angles in architecture photography.