You asked
Is the samyang af 35 150mm f 2 2 8 worth it?
Here is what the site says about that.
From Samyang AF 35-150mm f/2-2.8: Samyang AF 35-150mm f/2-2.8: A zoom lens by Samyang for Full frame cameras, 35-150mm f/2-2.8. Specs - Maker: Samyang - Focal length: 35-150mm (zoom) - Maximum aperture: f/2-2.8 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: Sony E, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E, L-Mount): as marked, 35-150mm. - On APS-C (Sony E, L-Mount): like 52-225mm ...
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.