I wonder if part of the reason the HD650 is so widely loved and popular is due to its ability to make almost any music sound good. Even if some day I get an HD800 (because I like a hyper-detailed sound for good recordings), I doubt I'll ever sell my HD650... simply because there are a lot of imperfectly mastered recordings that I really enjoy that just don't sound right on my analytical headphones (SRH940).
When I'm listening with my analytical headphones, while it excels at some things beyond the HD650 due to more detail and speed, I find myself being very choosey of what to listen to because all the flaws are revealed.
Honestly I don't think either is "better" than the other -- there's a place for detailed headphones and for musical headphones that play well with imperfect recordings. In an ideal world we'd all have perfect recordings... but that's not the case.
Exactly! The HD650 isn't very revealing and some of my okay recorded rock records sound really good, whilst they sound bad on the Q701!!!