I recently stated that the Leica 80-200 f/4.0 zoom was generally better than Leica's equivalent non-Apo prime lenses.
(And also far better than the excellent Nikkor 80-200 lenses I reccommended previously in this thread, which makes one wonder what "far better than excellent" really is ).

Other older Leica zoom lenses such as the 70-210 aren't in the same same class as the 80-200 f/4.0: I've heard they are still good (no personal experience), but are essentially Minolta or Sigma designs built to higher specs.