I've never really considered Olympus as an option because I thought Panasonic lenses work best with Panasonic bodies. But now you've got me thinking. I just noticed the new Olympus M.Zuiko 12-200mm f/3.5-6.3 Lens that my local camera shop will be selling end of March. So this lens will defiantly cover all the focal lengths I will need if I'm willing to pay over double the price for it compared to the Panasonic 14-140.
I know the 10x zoom 14-140 II is very good, despite there being some degree of universal skepticism about the quality of ANY 10x zoom. And I know that the Olympus 12-100 is an amazing lens. It has OIS, which is what operates on a Panasonic body, not the body's IBIS, and I think it is quite effective.
I don't know about the new 12-200, which is a
17x zoom lens. Natural skepticism rears its head, though. I'm not sure what reviews have come out on it to date. Going down to 12 and up to 200 is a benefit compared to the 14-140, but perhaps not so much if the image quality suffers.