Is the samyang af 18mm f 2 8 fe worth buying used?

Here is what the site says about that.

From Samyang AF 18mm f/2.8 FE: Samyang AF 18mm f/2.8 FE: A prime lens by Samyang for Full frame cameras, 18mm f/2.8. Specs - Maker: Samyang - Focal length: 18mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 18mm. - On APS-C (Sony E): like 27mm on full frame; f/2.8 gives about the depth of field ...

From Samyang AF 50mm f/1.4 FE: Samyang AF 50mm f/1.4 FE: A prime lens by Samyang for Full frame cameras, 50mm f/1.4. The 2016 original, heavier than the II and common used.

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