Love my Kohlert. Soft warm, but really blows/roars when I want to. I've a Beuscher 20A as well. That roars, but doesn't have the subtlety of the Kohlert. The only better (to me) sounding alto I've heard was a King Zephyr on a Brilhart Personaline.
Interesting. My newly arrived Aristocrat came with a Brilhart Personaline. I look forward to getting to know it.