On the topic of e-stats vs. ethereal, my long term experience is that "ethereal" is their mainstream quality, with mid-level e-stats and energizers. Where (some) dynamic and orthos may sound "hard", and it might be cured with top quality upstream, the e-stats tend to sound "ethereal" rather than "hard".
It's no news that as we move towards the higher end, the sound becomes fuller and with more body and definition as well.
My current top preference, a unique piece made by Phenomenon sounds fuller, including more bass slam than hard hitter dynamic champ headphones (including the Fostex TH900, Denon D9200, Focal Utopia and Stellia), leaving the Stax 007 (all versions) in the dust (IME), while the treble region is far smoother. In that respect it resembles a good orthodynamic, but has better to far better musical and spatial resolution. Every listening session is jaw dropping - I am sure many people have experienced that possibly with multiple headphone systems and I don't claim it would be the best available, but I have yet to hear something more to my liking.
I have also heard the labeled-ethereal Stax X9000 sounding full-bodied and with full dynamic swing in a sound stage without any "holes" from appropriate tube amplification (and from what I hear it can do even more since I listened to it last time). The Orpheus 2 and 1 also cannot be called ethereal (though it's hardly obtainable/accessible items).
But I do agree that _most_ e-stats may sound more or less ethereal, some of them as much as if there were phase problems (e.g. some Lambdas).
The Voce sounded a little bit towards ethereal as well, but had pretty good body and definition. I expect the Corina will do even better, so can't wait to hear
The unknown variables are the traditional elements of e-stat design (stator, membrane, coating, etc.), for which we don't know much yet, apart from the interestingly patterned stator, the gap and the presence of AMTS, from which I'd speculate they will benefit from a lot of power and will sound smooth, supposedly with good slam and body, but let's see if that happens on the expense of some other things.