With f2, it is very bright and perfect for me for events and group shots, but also landscapes. The excellent sharpness is maintained even at maximum aperture into the corners. The glass reaches the quality, where other manufacturers fixed focal lengths required. It is also worth the beautiful bokeh.
Small disadvantage: The upper area is with 35mm (70mm KB) a bit short for my area. But otherwise it is uncompromising and the workmanship perfect. The SWD-drive works silently and accurately. The Olympus 14-35 is sealed also. And the autofocus on the E-3 or E-5 still a tad faster than the 12-60mm - and that's saying something!
Images can be found if you "fotojell" search the Internet for. It should be noted, it should be: There are still only in Olympus quality zoom in the normal range, which are sealed and stabilized. And it even 3 different models. The two major suppliers and all the other must match embarrassing here.