Hi I have the Audeze LCD-2.2 - you must be asking why would i want a D2k -
Well when my wife is asleep and the inverter is running at night, I wondered if a closed headphone would be perfect, but I don't want to pay 1.6k for an XC!
I know the D2k will not be anywhere near as awesome as the LCD 2.2 but i can tell you I really really don't mind the sound of the X1 - exaggerated bass yeah, present midrange (yes that's how i'd describe it - you can tell it's there, not recessed, but not more to be said really), lifted low treble (guitars and hi-hat cymbal).
How does D2k compare to that?
Also is D2k leaky like an open? If it leaks bad there's no point getting it then ...