For my part, and based upon the Electrostatic speakers that I have operated over the years, I would, personally, place them in the following order of fidelity.
A. Martin Logan CLX (with and without Descenti's to taste), Sound Lab A-1/U2, Quad ESL 57.
B. Quad ESL 2905/2812, KingSound King III.
C. Quad ESL 63.
I retain the ML CLX Aniversary/Descenti combo and a couple of pairs of ESL 57's.
A. Martin Logan CLX (with and without Descenti's to taste), Sound Lab A-1/U2, Quad ESL 57.
B. Quad ESL 2905/2812, KingSound King III.
C. Quad ESL 63.
I retain the ML CLX Aniversary/Descenti combo and a couple of pairs of ESL 57's.