So I have had pink noise running through the HD650s for just a single evening, wake up this morning and wow do they sound phenomenal. Classical and solo pianist songs sound just stellar. Trying out some original movie sound tracks from Lord of the Rings/Hobbit right now, and the precision is just tremendous. Also I am not much into opera, but I figured I would listen to it a bit. The clarity of the singers voices is just amazing. Being my first "audiophile" grade headphone, outside of the PC360 or Astro A50 (not really audiophile grade), I am truly impressed.
On side note, before I got them in I came across a handful of reviews stating the one complaint about the headphones was their clamping force, of course I didn't see these reviews before purchasing. On the upside they feel great, a little bit tight, but defintiely nothing close to the MMX 300s. Anyhow, I decided to order the AKG K712 Pro as well yesterday so I can compare the 2. So should be getting them in today.