I'm giving this lens 4 stars mainly because I haven't had time to do direct comparisons. My overall impression is that the lens is much sharper than the 14-42mm that came with the camera. I see us wearing that lens alone, without the other lens. I also have a 45-200mm lens. Combining the two would essentially give us a 14.3x zoom instead of around 10x at 14-140. Is it worth packing an extra lens for an extra 4.3% zoom when that zoom doesn't typically produce the best handheld shots? The lens is quite heavy and much longer than the 14-42. It's shorter than the 45-200mm lens, but without weighing it I'd say the 14-140 is heavier. This gives the lens a premium feel, but can also make it difficult to wear around your neck all day. The wide-open F4 isn't as fast as the 14-42, but I went with the 20mm f1.7 lens for low-light situations. So far I haven't come across a situation where I'd like to take a picture where the 20mm lens wouldn't have enough light.
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