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: The pana's are interesting to say the LEAST, mids are extraordinary, highs have a good amount of energy, these have the ability to be another asset to the phones overall signature, which is extremely natural, timbre is the best. Now the bass is where these get weird, but not a good or bad weird just weird to someone who's never heard the chameleon characteristics of this particular bass.
Pros: Comfortable, Good Bass, Good Value, Great Sound, Stylish
Summary: I use these for work and they are solid headphones. They do not block out sound. The highs are crisps but the bass is lacking a bit. I'm a basshead so I wish there were a little more there. The IEMs are heavy in a good way. They feel like they could survive a war. Overall I like them, hopefully with a little burn in they'll kick a little harder.
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