As an old Leica M user, I was waiting for a combination of camera/lens that would give me a digital Leica experience without the cost/weight problems. I found that in the GX1 coupled with this lens. The results are nothing short of extraordinary. Pinpoint sharpness- vibrant colour and relatively light weight. I use the lens on all my G series digicams (G1, G3, GF1, GX1) and regret that I cannot use it with all my digicams. I have a friend in the Boston area who has the same combination and we agree that it just takes your breath away. It is better than the 1.7 Lumix as far as sharpness and contrast. I cannot recommend the lens highly enough.