The very best example of imagery that I ever heard was during an audition of a Quad ESL. The baritone sounded palpably three dimensional between the speakers.
So of course I had to buy them.
However my experiences at home were not so good (I later learned on here that my Naim amps were not the best match - the seller was using Quad amps, valve I think).
Still, I have to admit that no speaker that I’ve heard since (>25 years ago) has been able to recreate such ’reach out and touch’ imagery as those Quads did.
I think that your experience with the Quad was probably less caused by the pairing with your amplifier than room acoustic....
I own average good speakers Mission Cyrus 781 and what you described i never have it with my speakers BEFORE my acoustical controls installation...
After that their imaging,3-d holography and listener envelopment factor by 100%...
Acoustic controls is the most powerful upgrade anyone could do...