Sony fe 50mm f 1 4 gm vs sony fe 50mm f 1 8?

Here is what the site says about that.

From Sony FE 50mm f/1.4 GM: Sony FE 50mm f/1.4 GM: A prime lens by Sony for Full frame cameras, 50mm f/1.4. Specs - Maker: Sony - Focal length: 50mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 50mm. - On APS-C (Sony E): like 75mm on full frame; f/1.4 gives about the depth of field ...

From Sony FE 50mm f/1.8: Sony FE 50mm f/1.8: A prime lens by Sony for Full frame cameras, 50mm f/1.8. The cheapest way to a fast standard lens on Sony; slow, noisy autofocus by modern standards. Specs - Maker: Sony - Focal length: 50mm (prime) - Maximum aperture: f/1.8 - Made for: Full frame sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 50mm. - ...

Quoted from this site's pages.