I have this set, too. The sound on original LPs or Verve CD reissues is only slightly better. What bothers me more is that it does not include the piano solos and the few tracks where Shearing plays accordion. I have these on two compilations.
Together with the Savoy material it would be even better. I just happened to order a copy of an oop Vogue CD that includes the one track US reissues always omitted, "George's Boogie Woogie".