Wholeheartedly agree.I love the 2k copper. It was my first upgrade cable so I haven't compared with others like the Silvergarde but I'm really happy with it. Sounded fantastic with the Auteur I had a little while back.
I love and prefer mids/vocal over everything in a HP and the ZMF auteur, IMO is the king of mids and vocals. With the S4 cable, i was getting excellent treble extension, lots of air in the mids and vocals were in line the rest of the frequencies. However, with the 2k copper, the mids are pushed a little forward, while maintaining the same crispness of the S4. As a result, the vocals sound kinda 3d/holographic which is something that i crave above anything. Couldnt be happier with this combo. I guess Zachs headphones work best with Bevin's cable......who knew !!! LOL