Here you can see the standard kit zooms for several mirrorless cameras: From left to right: Olympus 14-42mm, Sony 18-55, Panasonic 14-45, Panasonic 14-42, Samsung 18-55. As you can see below, the kit zoom has a major impact on the overall size of the camera: Anyone browsing CSCs in a brick and mortal store is going to be influenced by the size and autofocus performance of the kit zoom. Kit zoom performance also weighs heavily in evaluations by the big review sites like DPReview, Imaging Resources, and DCRP. While enthusiasts bemoan the lack of fast zooms, it makes sense that manufacturers continue to focus their resources on developing the kit zooms that will make or break their high volume camera sales. It's interesting to see how each manufacturer has evolved their kit zoom over time: Samsung: The Samsung 18-55 isn't a bad lens, but it's not going to win them any accolades. It is the largest of the CSC standard zooms and not a standout performer in my testing at Serious Compacts. Credit to Samsung, though, for bringing out the 20-50mm zoom offering. The 20-50 has a collapsible design and is currently the most compact standard zoom available for a CSC. DPReview has a nice size comparison photo halfway down this page. Of note, the 20-50mm lens lacks stabilization, in contrast to the Samsung 18-55 and all kit zoom lenses from other manufacturers. Olympus: Olympus has been aggressive in its approach to the kit zoom. To begin with, Olympus introduced a collapsible design 14-42mm lens and quickly revised it to use a plastic lens mount for lower cost and weight. They then revised it again to bring out a version II lens with improved optics and performance optimized for video. Lastly, there is a strong rumor that a IIR version is coming soon (June 30 announcement) and will add extremely fast autofocus performance. Sony: Sony did a good job with the 18-55 zoom, creating a zoom that has very decent performance in a very compact size considering that it has to cover an APS-C sensor, is image stabilized, and is a non-collapsing design. That said, it is disproportionate in size to the tiny NEX bodies, and Sony would do well to find a way to make their kit zoom even smaller. In addition, this lens is not video optimized. Panasonic: Panasonic introduced the very first CSC kit zoom, the 14-45 OIS, and it is an outstanding lens in some ways while disappointing in others. It remains class leading in edge sharpness, probably the best landscape lens for our system at the 14mm focal length, and is a fast focusing lens. The Panasonic 14-42mm kit lens which replaced the 14-45 is slightly lighter and presumably less expensive to manufacture; however, it is also slightly longer and a touch less sharp than the 14-45. Unfortunately, both lenses are simply too big for the small CSC bodies (eg, GF series), and neither are video optimized. In order to compete in the mass market against APS-C offerings from Sony and Samsung, it is critical that Olympus and Panasonic find a way to capitalize on the strengths of the Micro 4/3 standard. I've seen marketing material from Panasonic in which they are pushing the better edge performance of the Panasonic lenses. In my opinion, they would have been better served by prioritizing lens size over edge performance as Sony did with their 18-55 zoom. With the rumored improvement in autofocus performance, Olympus will have a very strong standard kit zoom - small, sharp, and optimized for video. Most likely we will see the next iteration of the Panasonic kit zoom before year's end.