I bought this lens for my new Panasonic GX 1 .After first test I was pleasantly surprised. The photos are knackscharf .Einfach super. Add to that the light intensity f 1.7 allows you to take pictures without flash. Who wants to be the image sensor to meet its Lumix GX 1 should specify the lens itself. Full purchase recommendation. So 5 stars. The camera I've Bought a second, normally I shoot with Nikon D 700 and various lenses. I have just bought Canon S 110, Bld quality compared to Lumix GX 1 ???????? ,