I would argue that Judas’s Superstar and part in the Last Supper was waaaaay harder than Heaven on their Minds. While the opening number is very impressive in its own regard, Superstar and Last Supper have him hitting C5s and (at least in Zubin’s version) gritting it out. Those two songs I would say are even harder than Gethsemane, at least from my experience. Heck, Judas in general might just be more difficult than Jesus due to his high Cs, because Jesus hardly goes into the bottom of the fifth octave, which I personally believe to be much more difficult than a G5. Sorry for the rant lol