I've listened to the equinox. i'm pretty sure that the blue dragon has more resolution than it. there is one problem i'm hearing and that has to do with the treble, simply put the enormous drop normally found on sennheisers is no longer there, the trumpets sound loud and clear at the top.... at times, considering my source, this translates into harshness, even brightness for a second or two. it's still dark, like HD650 dark but the roll off has half disappeared (still somewhat there though).
the equinox is a bit clear, more upfront when it comes to the higher mid-midrange, which was a trait i liked. the blue dragon on the other hand has alot more dept, not that the soundstage is further away but that it is deeper.
edit: i'm sure that the silver ones probably are more detailed; my personal problem with them is that they really mess up the sound of violas and violins... in fact all strings (not guitar) dont' sound quite right on those cables.