I'd love to give you a straight and direct answer but it's very hard with IEMs because a lot of the time it comes down to how they fit and what kind of music you listen to.
Personally, I still find my UE Super.Fi 5 Pros to be very fun/comfortable/isolating phones to listen to. I normally use my UE10s but occasionally I am put in a situation where I'll use the 5s. They still rock. Like I said, though, comfort is always an issue with IEMs. Seal is everything.
Good luck in your search, though. If you have any questions feel free to pm me any time.
-TF
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Sources: Apple 160GB iPod Classic (black)
Current Phones: Ultimate Ears UE-10 Pro (black), Ultimate Ears Triple.Fi 10 Pro (black/blue), Sennheiser HD 600 Professional Stereo Headphones, Sony MDR-EX71SL (black)
Amplifiers: RSA Predator (Black), ALO Super Cotton Dock
Sold: Shure E4c (white), Ultimate Ears Super.Fi 5 Pro (black), Westone UM2 (black), Bose TriPort In Ear Headphones (black), HeadAmp Pico (Black w/ clear panels), RSA Tomahawk (black), RSA Hornet M (black), ALO Jumbo Cryo Dock, ALO Cryo Dock, Creative Zen Vision:M (30 GB, black), Apple iPod (80GB, black)
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