It actually looks like your headphones are missing quite a bit in the treble ranges above ~12000Hz. Of course, it's hard to notice without trying headphones with higher treble, but I felt Grado SR-60i's were definitely keepers. I could immediately hear a clearer and crisper bass on "Deliverance of the Heart" by zircon & Jillian, and way better (not just more, but better) treble on songs with female lead singers. In fact, on "Deliverance of the Heart", these headphones literally made me more aware of at least 3 more sound patches I didn't quite notice before.
I dunno, I just like how much better they sound than previous headphones I've had, and I've actually already written two songs on them now. I compared how they sounded on my previous two headphones, and they actually sound around as bad as they should (lol). However, no matter how bad they apparently sounded, they had an acceptable sound that the majority of people listening with consumer-grade headphones wouldn't really notice anything bad. That's why I think they're good; they made my two recent mixes sound good on not just themselves, but other headphones. Even my skullcandy earphones (which IMHO have too much low mids and too little treble) could play both songs back fairly well with decent accuracy..