If there's one thing JVC home theater projectors have long been known for, it's their having the projectors with the highest native contrast. Even without, the RS440U's dynamic iris engaged, there are few projectors (mostly more expensive) that can come close to handling dark scenes, like this JVC.
Iris engaged, you have to start looking at some Sony projectors that start at about double the RS440U / X590's to find comparable blacks. (Of course, in fairness, that Sony - the VW685ES, is native 4K, not a 1080p pixel shifter, so it is inherently sharper, for that extra price difference as well.)
Still, the point is, you love deep blacks on very dark scenes, you can't beat this JVC without spending a lot more!