I'm sort of in the camp of luck-neutral performance as a measure, so I'd say 81 pitch, 27 strikeouts would be perfect perfection.
I might say that Pedro's 17 K game against the Yankees on 9/10/99, with the only hit being a Chili Davis homer, was better than some perfect games. 98 game score, .623 WPA. 120 pitches, 19 swinging strikes, 29 strikes looking.
Compare that to Buerhle's perfect game
. 6 Ks, 93 Game Score, .290 WPA, 116 pitches, 6 swinging strikes, 22 looking. Buerhle more or less needed a spectacular catch by Dewayne Wise and solid defense throughout in order to even be in this conversation.