Phenomenal lens with great utility
I look at this as a functional counterpart to the classic Canon 24-105, which as a documentary filmmaker offers substantial range and practicality for most shooting situations. I've been using this on my GH5 with excellent results, for both video and still photography. The fly-by-wire focus is a bit annoying for manual focusing when shooting video (I don't find it to be an issue at all for stills), but I use autofocus often enough to where I don't find it a huge detriment to my work. The lens is well built and feels solid in the hand and on camera, and I basically haven't taken it off my camera since I got it. For those who need the utmost sharpness when shooting at longer focal lengths, they should know that this lens does soften a bit when fully extended, so you should be mindful to shoot a bit more closed down if possible in those situations.
It should also be noted that because the aperture almost instantly begins to close down if extending beyond 12mm, I generally consider this to be an f/4.0 glass. If you plan to shoot more regularly in lower light situations, the Panasonic 12-35 f/2.8 may be a better choice.
Overall, I'm very happy with this lens, and use it frequently.
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