You asked

Is the sony e 15mm f 1 4 g worth it?

Here is what the site says about that.

From Sony E 15mm f/1.4 G: Sony E 15mm f/1.4 G: A prime lens by Sony for APS-C cameras, 15mm f/1.4. Specs - Maker: Sony - Focal length: 15mm (prime) - Maximum aperture: f/1.4 - Made for: APS-C sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E): like 22mm on full frame; f/1.4 gives about the depth of field of f/2.1 there. - On the larger-sensor bodies of Sony E: ...

From Sensor sizes: Is full frame worth it?: For low light, events, and portraits with very shallow depth of field, yes. For travel, street, wildlife on a budget, and most hobby photography, a good APS-C camera with good lenses is enough, and you'll carry it more. Lenses and light matter more than the last stop of sensor performance.

Quoted from this site's pages.

From these pages