Is the sigma 30mm f 2 8 dn art worth buying used?

Here is what the site says about that.

From Sigma 30mm f/2.8 DN Art: Sigma 30mm f/2.8 DN Art: A prime lens by Sigma for APS-C cameras, 30mm f/2.8. Specs - Maker: Sigma - Focal length: 30mm (prime) - Maximum aperture: f/2.8 - Made for: APS-C sensors - Mounts: Sony E, Micro Four Thirds - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E): like 45mm on full frame; f/2.8 gives about the depth of field of f/4.2 there. - On Micro Four Thirds ...

From Sigma 60mm f/2.8 DN Art: Sigma 60mm f/2.8 DN Art: A prime lens by Sigma for APS-C cameras, 60mm f/2.8. A small, sharp short telephoto, cheap on the used market.

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