beetlemania,
Nice post!
I can tell you that if you were listening to the 3.7s you wouldn't have any reservations about the soundstaging, depth. The 2.7s I have do fore-shorten depth a bit, but the 3.7s sound just spreads massively, seems to go on forever in terms of depth and width. That's one reason they are still sitting in my house and I haven't sold them.
I find the same regarding the microdynamics in teh 2.7 as you do in the 2.4. They really excel in that area and given an aliveness and a sense of the actual changes in effort for a musician, even more than my 3.7s. I continually note how this plays out in vocals as well, like you mentioned.
The the inflections in a singer's performance are more pronounced and it's that much more like listening to a real person sing. When I spend an evening going checking out, say, Tidal tracks of various singers I'm continually struck the the sensation that truly unique and different voices are making appearances in my room.
And the fact the 2.7s produce the most concise, dense imaging I've experienced also makes it all the more palpable. And that's a curious area where our experiences part on our speakers. I wonder if this was an area somehow improved with the 2.7s (thought dense imaging has traditionally been a trait of Thiel speakers), or whether it is due to how you've set your speakers up. I find I have quite a lot of flexibility with the 2.7 and 3.7, and can go quite wide apart while maintaining image focus and density (though a bit less leeway with the 2.7s over the 3.7s).