With the recent introduction of the Panasonic 14-42 Lumix G Vario II, which is the new kit lens to be released with the GF6, we now have 7 kit zooms in the :43: mount. Of these five cover the 14-42mm range, one covers 14-45 and the final one covers 12-50. The 12-50 is an obvious outlier due to its wider range, its size (being nearly 20cm longer than the next largest option), its 1:3 macro ability and the fact that it is the only weather sealed option. The other six are relatively comparable. Here's an image of the six 14-4x zooms that gives an idea of their relative sizes (I didn't include the 12-50 here because I wasn't able to find an image that was scaled with the rest): And here's a comparison chart that breaks down the specs of all seven lenses: Which of these lenses is "best"? In terms of performance (sharpness, chromatic aberration, distortion, etc.) not a lot separates all these lenses from the reports I have reviewed. The Panasonic 14-42 PZ might be the best performer objectively according to the tests I have seen. My personal speculation is the the new Panasonic 14-42 mk II has a similar optical design to the PZ with the removal of the auto-collapsing feature and the addition of zoom and focus rings, so I would expect it to perform similarly. Note that this is based purely on my speculation, I have not yet seen any tests of the new lens. In terms of ergonomics, the two Olympus lenses feature a collapsing design -- they must be manually extended prior to shooting. The Panasonic 14-42 PZ also collapses, but it extends automatically when the camera is powered on. The PZ also differs from the others in that it lacks zoom and focus rings -- zooming and manual focusing is accomplished via power assisted levers on the side of the lens. It is also the only lens on which zoom can be controlled via the camera with certain bodies. The Panasonic 14-45 differs from the 14-42 mk I (aside from a slightly longer zoom) in that it has a metal mount and is considered to have a superior "build quality" to the others. It is also the only kit zoom with an OIS switch, which means it's the only one on which OIS can be enabled on an Olympus body, for whatever that is worth. EDIT: The addition of the "Lens I.S. Priority" option in the E-PL5/E-PM2 allows the cameras to disable the IBIS and utilize the lens OIS in any lens so equipped (regardless of whether the lens has an OIS switch). With any of the older Olympus cameras (including the OM-D), the P14-45 is the only kit zoom which can utilize lens OIS (instead of IBIS). It's worth noting that the Olympus lenses lack OIS, so this is a consideration for those shooting with Panasonic bodies (the Olympus bodies all have in-body stabilization). In a similar vein, the Panasonic lenses exhibit some defects which are auto-corrected by the Panasonic bodies. If you shoot with Panasonic lenses using an Olympus body, you will not get the benefit of these corrections. Please share your impressions of the kit zooms. What have I missed or gotten wrong?