Munson vs. Joe Mauer, who's on the ballot for the 1st time this year via Baseball-Reference's cool "compare tool":
Mauer was worth 7.6 WAR after his age 32 season. If you cut those off and end both after their age 32 season, they're within 2.1 WAR for their career.
Munson's career WAR is higher than both Buster Posey and Yadier Molina, both of whom are often talked about as future Hall of Famers.
Personally, I think all four belong. Most of the catchers in the 40's WAR-wise wouldn't be terrible HOFers.