By coincidence I have these two cords in my system, and don't hear much difference. Maybe the ESP is a shade fuller/richer/darker with a bit more in the way of dynamic power, and the Pro-11 a bit lighter/more detailed/less dynamic, but the problem is I have never heard the Pro-11 without the signal also passing through some component with an ESP cord. Can't see this helps you much, but it's the best I can do.
ESP Essence power cord VS. H.T. Pro-11
Anyone outthere have any experience with these 2 cords? If so how do they compare?