Summary: I got these to, what I thought, temporarily replace my Senn IE6 which will soon be sent off for repair... However, after using them, even BEFORE they are fully burned in, I've decided to make these my primary pair. These are possibly the best in ear headphones I own. If I was going to compare to the others I'd say they have less bass than the Sennheiser IE6... Have less isolation than UE Super.fi 4... and have less of a sound stage than both the Senn and AT headphones.
Summary: These are Panasonic's high end in ear monitors and they look and feel top notch. Like the detachable cable, c.zarconia body, and the sound is great too, everything you need: solid tight punch deep bass, clear mids and highs. I couldn't get a seal but I wear them with the cable upside down and the cable looped around my ears so I can get a good seal. Once you get a good seal, the bass comes back out to play, otherwise you will have zero bass.
Pros: Durable, Good Bass, Good Value, Great Sound, Stylish
Summary: I really like these IEMs. The casing is almost indestructible, they have detachable cables, and the sound is great and very clear for dynamic drivers.
The casing is made from Zirconium. They're advertised as being related to diamond, which isn't true and a little too much marketing speak, they are indeed very very hard.
The sound is a little bit V-shaped with too much emphasis on the bass & treble.
Cons: Little too much bass & treble, expensive now