Sibelius: I would agree that the Essence were better on jazz and vocalists than on rock, hip hop, electronica, etc.. They got really "busy" easily with anything too fast paced. In comparison, the Omen Defs and the Superfly's have much better dynamics, much better detail, while being what I like to call "musical" for lack of a better term. They sound much more like live music and have a much wider and deeper soundstage. And IMO, vocals and jazz and rock and all genres sound better than they did on the Essence. The change was so dramatic and such an improvement that no direct A/B was required. I just got out the boxes for the Essence and put them up for sale within a day. And that was when I was running the Melody I2A3 that 6 Moons raved about with the Essence (it was dead quiet and awesome on both speakers btw).
BTW, Zu has a closeout special on the standard Soul in a very nice Maple for $999. That will be hard to beat at the price.
Best of luck,
Morgan