I'm certainly of the opinion, save up, save up, save up, get the Zeiss.
It's related to the C/Y 21mm Distagon, the 35mm Contax 645 Distagon, the 40mm Hasselblad Distagon. All of them are outstanding examples of Retrofocus wide-angles.
Surely, a zoom is more 'versatile', but once you start seeing the resolution and 'zeiss-look' from any of these lenses, you may as well just get out the instant glue and permanently attach it to your camera...