Not really such a thing as a "downgrade" in headphones unless the shift is dramatic (i.e. HD 600s to PortaPros).
I tried out these headphones and damn, they need a lot of juice. Not something that I could run off of my phone at all. They were comfortable except for that stupid headband. I really liked how they sounded (such clarity, much wow), but I thought the bass could be improved. Only the bumps on the headband really hold me back from wanting them. How's everyone felt about the headband?
The headband doesn't bother me it's the cups/pads stiffness and the clamping pressure bothers me...
It's either one or the other with the Q701s. I found the pads very stiff at first, but they really eased up over time.
If you guys haven't seen, I took apart the K701's headband and replaced they acrylic bumpy thing with a thin strap of high quality leather. More comfortable than the K712. One of the most comfortable headphones I've used now.