hakushondaimao
Headphoneus Supremus
Excellent summation in comparing these two popular headphones to the R70x and is pretty much what I am hearing also. For me it's about overall tonal neutrality. Yes the HD650 sounds a bit more textured and rich but at the cost of some coloration. To my ears there is just something unatural with the AKG house sound that I could never warm up too.
IMO with solid state amplification using dynamic drivers, the R70x is one of if not the best sounding compromise yet between overly analytical headphones like the Sennheiser HD800, Beyerdynamic T1 or DT880, and the very musical yet somewhat colored sound of the HD650 or Fostex TH900.
Thanks for the comment. I would agree.