Expensive for me right now, but interested because I love treble. Never had trouble with Grados (in fact the Prestige X series sounds fine but seems to be afraid of treble extension now to appease the "too sibilant!" audiophile masses. It does sound good, and Grado-like, but something is missing.)
How do they compare to Jupiter? Are the upper mids similar, or is it the low mids that are recessed instead (did not find any graph because I read the thread a bit too quickly)?
These will be right up your alley. The treble is present and forward, but not sibilant at all here.
You're correct, no graph yet. People who have them and can do graphs are either off for the holidays of the Saber hasn't reached them yet.
I'd say the upper mids are slightly more recessed the lower mids. That said, I don't think the mids are recessed at all for a Campfire IEM.
This a quite a neutral and relaxed tuning, especially in the low end for what they are usually known to do.