Coincident Total Reference vs Zu Definition

Has anyone listened to Coincident Total Reference retail $22,00? In particular I would like to know comparative difference with Zu Definition neither of which I have heard but are the leading contenders for my speaker selection. I would like to know if it is worth while paying extra $12,000 to go with Conincident Total Reference. I want a second system for the master bedroom which is fairly large and I'm thinking of using Melody P1688 Signature preamp and Melody M2A3 dual mono amps as associated equipment. Any comments or suggestions appreciated.