Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Does anyone found distortion an issue with this lens?
Document: Initial testing was good, but some images appeared very soft when they shouldn't be. After digging through some forums and reading up a lot, I found this lens has a vibration issue that causes a "double image". Some people attributed it to the OIS (stabilization) but that is not the case.I did some test photos with the shutter speed between 1/60th and 1/200th second.
I also found the focusing fairly quick, with no hunting or hesitation. For a compact zoom, this lens is truly outstanding. Buy it with confidence!
I must have purchased a good copy of the lens - purchased from amazon, in the beginning of May. None of the double image issues at the long end of the zoom even though I spent more than an hour trying to reproduce the issue.Other than this I find this lens to have a standard zoom lens quality - good enough for most day-to-day needs. And the great thing - it is sooo small.
So it is certainly possible to get a good lens, and optically it appears excellent. If not suffering from the double image issue it probably is a four or even five star product.Until Panasonic sorts this out probably best not to purchase the lens. Or, if you want to give it a try, purchase, test thoroughly and then return defective product to Amazon. You don't want to deal with Panasonic service - they stink - just return it to Amazon as defective.
Effective in hooking up a fine Olympus 18-180 Lens to my Panasonic GH3. I do have to manually operate the lens but have gotten some great pictures from it. I have since upgraded to a panasonic 14-140. I frequently use manual and have found the Olympus can produce some very exact photos with time. And as the GH3 is so adaptable, it opens up the possibility and opportunity to utilize other lens.
I bought this lens refurbished and I was aware of the problems some had encountered with double images at some shutter settings. I ensured I had the latest firmware in camera (Lumix GF1) and lens and I have found no trace of the problem. I understand the latest firmware is supposed to have resolved the problem: from what I can see, the lens is sharp as a tack and shows a very high contrast level.
I had 3 copies of the x14-42 and i was not able to get really sharp images at 42mm with neither of them. Even at higher shutter speeds like 1/1000 there was some irregular behaviour depending if OIS was on or off. With on i got sharp images in the center with soft corners, with OIS disabled the corners sharpened up, but the center became soft.As it is now I cannot recommend this lens to anyone.
After waiting for six months after it was promised I finally managed to buy this lens as a replacement for the kit 14-42mm Lumix lens ( not a bad lens itself).So far no complaints. it is fractionally sharper than the old Panasonic 14-42, smaller, and easier to use. Now I finally have some room in my camera case. I have found the motorized zoom and manual focus to be faster and easier than the old manual zoom.
It has a penchant for shooting fuzzy scenics, even at high shutter speeds, and in any situation it is liable to shoot fuzzy, indistinct shots; even at its best, in fact, it is far poorer than the DMC-FZ47 that this system is replacing. [ unrelated comments removed ]If anyone decides to get the DMC-G5 camera, which I highly recommend, my suggestion is to get just the camera body, and leave that poor lens behind.
This lens works great on the Panasonic GX7. This lens is very compact and  lightweight. The optic quality is also excellent. The silent zoom and focus operation are nice for video. I upgraded from a Nikon D70, Canon point and shoot and video camera. With this lens the GX7 takes the place of all of those and does a better job. The only negative I have found so far is that the zoom lever is awkwardly placed. It would be easier to use if the focus and zoom levers were switched.
Answer: I use it on an Olympus OMD5 and an Olympus Pen3 have not found any significant issues with distortion.  I do have lenses both from Olympus and Panasonic ( the Lica series) that are sharper and better performers.  I bought this lens because of its compactness when traveling. It is  a good lens but not my best lens.