Now, my list of the best systems regardless of cost:
1) Aries Cerat (Final Sunday setup). This huge ambitious system was a challenge to get setup and sounding up to it's potential and improved everyday from Thursday onward. My rating for the best sound at the show is based on the final sound achieved on Sunday. I can understand those who thought it didn't sound good on Thursday and Friday but the transformation to Saturday and then Sunday cemented it as something truly special. Simply the closest to live dynamics, live tone, live resolution that was at the show. As a note, I went to a Shostakovich Opera (The Nose) in Munich and got a huge dose (too much actually...it is a hard opera to listen to) of live, huge dynamics and many instrument live sound...AC sounded more like this than the others
2) Acapella Hyperion with Acapella electronics. Very natural and dynamic sound. Slightly less "real" than AC but not way off the pace. Huge dynamics and awesome transparency. Perhaps slightly more forgiving of poorer recordings and somewhat more room friendly...as long as your room has a high ceiling. The ion tweeter has such effortless highs and is so well integrated you never think about a tweeter...the right amount of highs are just there. Transparency is superb and coherence is so good it's hard to believe from a multi-driver speaker.
3) Diesis Roma Triode speakers with huge open baffle subs (not sure about what electronics were used). While third on my list, it is a distant third from the other two. It is also significantly less expensive (but still very expensive). Dynamics are very good and tonality and space are also very good. Resolution is good but not at the level of the others...at least in this big room. IMO, this room is too big for this speaker...even with the subs (it was well over 100m2...maybe closer to 200m2) and it gets a bit swallowed up in it. A few years ago they had this speaker in a much smaller room and with either Kondo or their own hybrid and it really was amazing. You hear some of that here but it is no longer the drama it should be. Still, it does a hell of a lot right and IMO beats most others.
4)Sigma MAAT XAC with Canever electronics: Again another step down from No. 3 but probably with as much potential. Limited by the room size and perhaps the electronics as well, This system still had awesome resolution and dynamics. Bass was more reserved than one would expect for having two huge 15 inch woofers per side but perhaps they are adjustable somehow and they dialed it back not to overload the room? Natural tone was also on display here but not the utter realism of No.1 and 2.
5) Diptyque/Kora A fraction of the price of the others but delivering some of the best sound at the show without reservation. Only bass impact might be found wanting by some. Not quite the spooky realism of the best above but not far off and better than the myriad of other speakers. Amp choice may or may not be limiting factor here.
Unrealized potential:
Line Magnetic LM-3 field coil speakers with LM electronics. Only got a very brief listen in a tiny room for such a big system...well there is serious potential here for live feeling (albeit coming with some tonal coloration). Heard something similar many years ago in Switzerland and was flabbergasted by how good it was. The sound in the small room was excellent nonetheless and hinted at what could be.