I'm not very good in timbre judgement, but well, it sounds very natural to me. Especially that we have much more DD goodness here than with Erlkonig. It seems like a neutrally V-shaped, open-back Erlkonig with more DD timbre. I think DD goes up at least up to 1 kHz. And the upper mids are very neutral. Highs I do love too.
Soundstage is huge. I am not doing A/B comparisons with Jewel etc. - this is not a contest of who is better to me. It seemed large from the first minutes of listening, contrary to the mini-review posted by Tfenton02 before.
The only thing I'm missing after several hours of listening is a bit more of middle mids (again, this is more V-shaped than neutral, and I prefer neutral). They are a bit sucked out, but again, it's the same story with RN6 and no one seems to notice