Three words: Oh, my God.
Mind you, my point of comparison is a set of much loved and oft worn Senn HD 448s. But these blow them out of the water. Why? Mainly on the trebel: I've been sampling Beethoven cello sonatas and the Late String Quarters and am hearing them essentially for the first time. Everything sounds different. Brighter. More detailed. I am hearing the sound of string instruments better than I ever have coming out of a recording.
For a change up I just threw on Bjork's Homogenic. Wow. It's almost brash; perhaps that might settle down a bit after burn in? The good news is that the bass definitely is not lacking.
I'll post more impressions later. But so far I feel like I've entered a whole new aural world.
By the way: I got these five days after ordering them from Musica Acoustics.