One letter shorter (28) and you've got "Waltz, bad nymph, for quick jigs vex!" I prefer that to the 27 letter "Quick nymph bugs vex fjord waltz."
And the only couple perfect pangrams listed are "Mr. Jock, TV quiz PhD, bags few lynx." or "Cwm fjord-bank glyphs vext quiz" (which even given the obscure words seems like it's missing an article before quiz).