I listened to both at Canjam - Katana and Encore. My favorite was Encore, almost on the point of buying the Encore but when I listened to Aether afterward...it's just plain better and it was shocking for 2 years old iem.
Not sure where all the hype for Noble came from...
I concur; I too prefer the Encore over the Katana. Back when the original K10 came out, both its sound and build/cosmetics were unprecedented, eventually amassing the FAR overstated "20-something-5-star-reviews" on Head-Fi. The difference is, everyone else has pretty much caught up now, and what they have to offer isn't so far high up a pedestal anymore.