>>4242598All due respect anon, they're not even in a comparable price bracket.
iPhone is like $1200. G9II is $1900 without a lens. OP's budget is $1500. G9II is worse for video than GH6, because it lacks the cooling.
But if OP wants to be part of the height of photography as an art, filmmaking that is, he doesn't need an expensive body. What he needs is one that provides the required quality without getting in the way of the production, and blowing the budget is one way of getting in the way. Luckily, the required quality comes cheap.