Image courtesy: Photozone
Photozone tested the 9mm lens-cap:
Honestly, it isn’t quite a bad as you might think. The center performance is actually pretty decent. The borders are Okayish whereas the corners are very soft. Lateral CAs are significant but not terrible either. There’s some vignetting but honestly this isn’t anything you’d complain about in a fisheye lens. Compared to conventional lenses, the contrast is somewhat reduced especially in the corners. However, on the positive side it is pretty resistant against flare which is rather surprising.
SLRgear tested the 14-42mm pancake zom:
The Olympus 14-42mm ƒ/3.5-5.6 EZ ED M.Zuiko Digital lens is a well-executed lens. It achieves what appears to be a goal for the smallest size possible, as well as adding in new functions (power zoom) and improving on its optical properties as well.