You asked
Is the laowa 7 5mm f 2 mft worth it?
Here is what the site says about that.
From Laowa 7.5mm f/2 MFT: Laowa 7.5mm f/2 MFT: A prime lens by Laowa for Micro Four Thirds cameras, 7.5mm f/2. Specs - Maker: Laowa - Focal length: 7.5mm (prime) - Maximum aperture: f/2 - Made for: Micro Four Thirds sensors - Mounts: Micro Four Thirds - Stabilised: no - Autofocus: no, manual focus What it frames like - On Micro Four Thirds (Micro Four Thirds): like 15mm on full frame; f/2 gives about the depth of field of ...
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.