You asked
Is the om system m zuiko 14 42mm f 3 5 5 6 iii worth it?
Here is what the site says about that.
From OM System M.Zuiko 14-42mm f/3.5-5.6 III: OM System M.Zuiko 14-42mm f/3.5-5.6 III: A zoom lens by OM System for Micro Four Thirds cameras, 14-42mm f/3.5-5.6. The splash-proof update of the 14-42mm II R kit lens: the same element layout, and it focuses much closer. Specs - Maker: OM System - Focal length: 14-42mm (zoom) - Maximum aperture: f/3.5-5.6 (it gets darker as you zoom in) - Made for: Micro Four Thirds sensors - Mounts: Micro Four Thirds - Stabilised: no - Autofocus: ...
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.