Summary: The test for personal headphones is always how they sound to the end user. One person might prefer Senns over AKG, another might prefer Grados. When I was looking for portable headphones for my phone, I checked the selection at my usual store, Bay Bloor Audio in Toronto. The AKG 450 sounded better to my ears and for my purpose so I bought them and loved the sound. I still do.
Pros: Very good sound, light weight, low power requirement
Cons: Cabling is unacceptably poor quality and spoils the experience