I just picked up Zu Definitions, $9k and worth every penny. 4 powered 10" drivers per side, 2 passive 10"s and 1 supertweeter per side. My 6-watt amp allows them to play effortlessly to obscene volumes but they communicate music better at listenable volumes than anything I've heard.
Everyone says this of their favorite gear, I know, but this is the high-efficiency ideal realized. I haven't heard the Wilsons or any other really expensive speakers either.
But, there is a difference spending dough. It isn't small. Is it worth the money? To me, without question.
For what they provide, I feel these are excellent value.
FWIW, the rest of my system is: 15-year-old Technics CDP as transport, Red Wine Audio battery-powered non-oversampling DAC, Modwright SWL 9.0SE tubed preamp, Red Wine Audio Clari-T battery powered amp.
All the electronics combined would retail for about $3,700. Aside from the Modwright, it's downright ugly. I've got it all sitting in ill-fitted shelves I built. This is not a jeweled showcase. Oh brother does it make music though.
I've said it before - musical conviction relies as much or more on dynamic capabilities than frequency response. Go forth and listen to high-efficiency gear, people. You may decide you don't like it but then you Know. Assuming is just a darned shame because you don't know what you're missing.