You guys listened to the wrong format and wrong issue.
Strangely enough, German LPs pressing from about 1982 is bad. German CD from 1990, or so, is bad. U.S.A. CD (Virgin) from mid-1990s sounds almost the same except it is much more clear which reveals even more how poor of a sound quality/recording it is. The best amongst them is relatively recent half-speed master LPs. Which does not mean it is anything good. It is only less than entirely pitiful. I prefer that German pressing from 1982 but it is not because of the sound quality as there is none.
I have not heard the 1994 cassette, but, to paraphrase one of the lines in Roman law, what was not good from the beginning will not get better with time passing. Except maybe Ummagumma. Which does sound marvelous on an Italian cassette.