Sorry for the late reply. It was very difficult to put into words what I hear.
I'll focus on what I like most about the Blue Dragon- its holographic imaging! I have heard many headphones that separate instruments unnaturally (ER4p is the worst example), giving the illusion that the sounds are from singular points and projected in lines. With HD650 + Blue Dragon, there is natural balance among the spatial separation between the instruments, the size of the instruments, and the blending of their sounds when they reach my ears. In a rehearsal room, you hear instruments blend with each other, yet you can extrapolate where they are placed; this is what the HD650 + Blue Dragon does.
quick edit: The stock cable imaging is relatively confused and dense. The Silver Dragon is heading towards the ER4p direction, but is much closer to natural.
It is getting late, I will have to write more tomorrow.