You asked
Should I upgrade from the zeiss zx1?
Here is what the site says about that.
From Zeiss ZX1: Zeiss ZX1: A fixed-lens compact by Zeiss with a 37.4-megapixel full frame sensor, announced in 2018. A full-frame compact with a fixed 35mm f/2 lens and Lightroom built in. Specs - Maker: Zeiss - Lens: built in, 35mm f/2 - Sensor: Full frame, 36 x 24mm, crop factor 1.0 - Resolution: 37.4 megapixels - Stabilisation: none - Announced: 2018 - Type: fixed-lens compact Focal lengths on it Its 35mm lens frames like ...
From Buying used: Buying used: Cameras and lenses are built to last, and many photographers upgrade often. That makes the used market one of the best ways to afford good gear. A body that's one or two generations old is often most of the camera for a fraction of the price.
Quoted from this site's pages.