Photozone tests the Olympus 14-42mm EZ. And says the Panasonic PZ is the better option.

Image courtesy: Photozone

Photozone (Click here) tested the Olympus M.Zuiko 14-42mm f/3.5-5.6 ED EZ

Combined with a small MFT camera such as the Panasonic GM1 or GM5, it is really a pocketable setup similar to a high-quality digicam. Unfortunately the reduced size comes at a price. The optical quality isn’t quite comparable to the best standard zoom lenses of the system.
Well, the king isn’t dead yet – the Panasonic Lumux G X 14-42mm f/3.5-5.6 PZ Power OIS remains the best option in this class.