In case anyone is interested, innerfidelity.com posted the LCD-X measurements. They are excellent (as I've come to expect from Audeze):
http://www.innerfidelity.com/images/AudezeLCDX.pdf
The one thing that initially jumped out for me is the 300Hz square wave plot is the best I've seen from an Audeze headphone. Notice how the square wave settles right down after the first overshoot. On the LCD-2 there were 2 overshoots, both about the same; and it was improved on the LCD-3 (though still there to a lesser degree). On the LCD-X, looks to be completely cured. It can partly explain the amazing imaging and instrumental separation that I'm hearing with the LCD-X.