I was on the fence last year until I started looking at Panamorph lenses and 2.4:1 screens. When I learned that the DCR lens for the NX models is not compatible with the 790 I realized I didn't want to sink money into the non DCR lens that I'd only end up selling later. So I shelled out for the Paladin DCR and NX7 then sold the 790 to a forum member. I never looked back. The tone mapping for ALL of my HDR sources makes the home theater experience all around better.
Though, the 790 is a good enough projector that you can't go wrong with keeping it if you don't wan to spend the extra dough.
So, Panamorph DCR lens + tone-mapping (more $$$$) vs slightly higher contrast (not very obvious to my eyes) I'd say are on each end of the scale.
Which way does it tip for you?
JVC NX7, Paladin DCR, 125" 2.40:1 Seymour Center Stage UF w/masking
(previous: JVC 540/790, Epson 5040UBe,+more)
Sony 75XZ9D, 75X900E, 65X850C, 800E, Panny 4K, Plasma, & more...
(Previous: 65" 930E, 940D, LG 65" C7, 65" 900E, Samsungs, etc...)
speakers: Dynaudio M1's, M3A's, BM15A's, NS10's, dozens of Bryston amps