I think the easiest thing for me to say is it just sounds more natural to me. It seems to capture the essence of the music better. It's not one of those cut and dried things like this is better or that is worse. It is the overall performance. The Calypso just sounds more right to me. The JE actually had a tiny touch of hardness in comparison and just didn't exibit that total ease of reproduction.
My system consists of the Calypso, the Theta Dreadnaught I, a Wadia 861se with AQ balanced Cheetahs and biwire Kilimanjaro's. I use Vandersteen 3a Sigs (soon, very soon, to be replaced by the 5A's.)I was using a pair of 2Wq's but they have since been sold to make way for the upgrade.