ThePhoBlographer posted the full lens review and concluded:
You can probably tell by now that I don’t know how I feel about the Panasonic LUMIX S 20-60mm f3.5-5.6. It joins a bunch of others as being mild-mannered options. Of course, you have to expect this of a kit lens. But for the new photographer who grabs a Panasonic S5, they’ll be semi-satisfied. I strongly recommend getting this lens with a few others. Sigma has some affordable L mount lenses. Specifically, their primes are wonderful. Leica goes off into the higher end of things. Panasonic is a middle ground in some ways. But in other ways, they’re also incredibly high end. Either way, it’s unfair to compare the Panasonic LUMIX S 20-60mm f3.5-5.6 to those other lenses. At the same time, you can’t get over it when you know what’s possible. This lens is also right around $600 by itself. Honestly, I’m not sure I’d buy it, but that’s just me.
You can get the lens for $597 at BHphoto, Adorama, FocusCamera.