I don't doubt a Hassleblad mount Zeiss CF lens would knock spots of an East German lens for build quality, but comes in at maybe ten times the price of a CZJ Biometar. Personally I don't own any modern West German Carl Zeiss camera lenses because I can't afford them.
I said that in relation to the idea that the Carl Zeiss factory in Jena was making poor quality camera optics. Most (maybe all) of the camera lenses were made at the Carl Zeiss plant in Saalfeld. The Jena factory was about as high tech and modern as anything you would find on the 'wrong' side of the iron curtain - but they didn't produce the camera lenses, That is what I meant by wide of the mark.I think to characterize it as a budget maker of dodgy camera lenses is wide of the mark.