You asked
Is the sony e pz 10 20mm f 4 g worth buying used?
Here is what the site says about that.
From Sony E PZ 10-20mm f/4 G: Sony E PZ 10-20mm f/4 G: A zoom lens by Sony for APS-C cameras, 10-20mm f/4. Specs - Maker: Sony - Focal length: 10-20mm (zoom) - Maximum aperture: f/4 - Made for: APS-C sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E): like 15-30mm on full frame; f/4 gives about the depth of field of f/6 there. - On the larger-sensor bodies of Sony E: ...
From Buying used: Buying used: Cameras and lenses are built to last, and many photographers upgrade often. That makes the used market one of the best ways to afford good gear. A body that's one or two generations old is often most of the camera for a fraction of the price.
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