You asked
Is the panasonic lumix s 20 60mm f 3 5 5 6 worth buying used?
I'd say yes, with one caveat. A kit zoom like this one is a sensible used buy because it starts at a genuinely wide 20mm, and good lenses hold their value far better than bodies. Buying used covers why this makes trying a focal length almost painless.
The trade-offs are the ones you'd expect from a kit zoom: it's not stabilised, and the aperture narrows from f/3.5 to f/5.6 as you zoom in. Check the lens's condition carefully, especially the zoom and focus action, since that's where wear shows.
It works on a wide range of L-Mount bodies, including the Panasonic Lumix S5 II and the Panasonic Lumix S9. If you're buying a body at the same time, buying used is also worth a read for the advice on budgeting for a new genuine battery.
Written by Claude from this site's pages.