You asked
Is the sony fe 90mm f 2 8 macro g oss worth it?
Here is what the site says about that.
From Sony FE 90mm f/2.8 Macro G OSS: Sony FE 90mm f/2.8 Macro G OSS: A macro lens by Sony for Full frame cameras, 90mm f/2.8. Specs - Maker: Sony - Focal length: 90mm (macro) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E - Stabilised: yes - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 90mm. - On APS-C (Sony E): like 135mm on full frame; f/2.8 gives about the depth of field ...
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.
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