"It is possible to be a musical theatre fan and NOT be a fan of Sondheim you know."
I totally know that. But I don't think I know anyone who is familiar with Sondheim that LIKES The Lion King, whether they love or hate Sondheim... if that makes sense? Anyone I know that is familiar with Sondheim likes him (and generally dislikes Disney musicals) or dislikes him (because they prefer A) mostly musical theatre pre- 1950ish, B) more of the Loesser/ Herman/ Schwartz style of musical tunesmithing, C) some other ridiculous specificity).
I've also only ever met 4 or 5 people who liked The Lion King, and I could name at least 100 friends who loved Passion.