I just received this lens and have used it quite a bit with my Panasonic GX8. Wow, I'm impressed. It is excellent. I've mostly used it at the long end at 300mm and wide open at f5.6 for birds and it's nice and sharp even outside of the aperture. Birds have a lot of feather detail even at a distance. The stabilization seems to work very well. At least it's as good as my Olympus 75-300mm which I'm about to sell and I really think it could be a bit better. It's definitely nice to get an extra f/5.6 wide open on a telephoto lens, compared to Olympus' f6.7 wide open at 300mm.
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