I have had coffee prepared by a Chemex, around a decade ago, in a restaurant, subsequently closed, that - shortly after my visit was awarded a Michelin star - and - exactly as you say - it produced a very clean coffee, the coffee in question was Ethiopian (I asked) which I liked a lot; precisely because I liked the coffee so much, the owner gave me a bag of Ethiopian coffee to take home - the coffee he used - and that was my introduction to Ethiopian coffee (which, as anyone who encounters my posts here - or, even, my signature - will know I have come to love).
However, I do wonder whether the method of preparation has had anything to do with this.
For now, this week, since I ran out of my own ordinary coffee earlier in the week, I have been surviving on Bosnian coffee, my emergency supply.