They have a rather strong bass, one of the best and most visceral I've ever heard in an in-ear, they have a somewhat slightly recessed midrange, and a sparkly treble, with a lot of energy and detail. In the midrange, they have some of the best textures and detail + micro detail a IEM ever had, and their imaging and instrument separation is phenomenal. I think RE2000 is not sibilant at all, but it is energetic, not smooth in the treble
They are a personal favorite actually, but I also like IE800 quite a lot, how do you feel about them? RE2000 is an upgrade in terms of midrange details and even bass viscerality, curious how you heard IE800, and what you liked, and didn't like about Ie800 when you tried them