He also says the Zeiss ones are built like cheap 1970"s lenses.
I haven't verified this quote, but the current Zeiss lenses take what's good out of the "cheap 1970's" lenses such as metal barrels, helicoids, mounts, filter rings, and barrels, and leave behind what was "vintage," such as balsam optical cement and minimal lens coatings, limited glass choice, and pre-computer optical designs. Nor am I going to try to speak to "better-or-worse," because I've tried an "apples-to-apples" comparison.
Nor can I say they are "worth getting." Value is subjective as is price sensitivity. If you are reading this, chances are pretty good you aren't looking to maximize "sharpness" or so-called "IQ" -- analog 35mm photography is simply the wrong platform for that. So "better or worse" than "equivalent Nikkors" (when they exist) also becomes subjective. If you can't take a world-class photo with any of the Zeiss ZF.2, Milvus, or Otus lenses, chances are very good it ain't the fault of the lens.
I don't own any Zeiss ZF.2 lenses because I'm pretty sure I wouldn't use them enough for warrant the cost. I only use manual focus gear about 15-20% of the time, and that includes medium format "stuff." What I can say is that in today's world these lenses are aimed at a niche market. Niche products come at a premium, as does quality control and yes, the Zeiss name. If you want a prime lens, are comfortable focusing manually, love the feel of a traditional metal helicoid, but prefer the predictability of a more recently produced product, the Zeiss lenses will deliver.