I think the AKG K701 and Beyer DT880 are way on the bright side of neutral, while the HD650 is more natural sounding. To each his own.
Edit: Although I must say, the most neutral headphone I've heard (and I know many will argue with me on this) is the HD800. Even against the T1 and HE500.
Yes they are on the bright side, and for me it cause fatigue on "not so long" listening session and maybe can damage ears too, because if I insist on listening while my ears is fatigue, I found a little discomfort (read: hurt) on my ears drums... So why buy headphones that its sound we can't enjoy completely ? There are many opinions out there, some says HD 650 veiled or this or that, but I just find a headphone that my ears and "heart" can enjoy it completely 110% (--> means can cause eargasm on some songs), and I have found it.
No listening fatigue at all, no hurt on ear drums at all, maybe that little "veil" is used by Sennheiser to protect our ears..., although for me HD 650 just sound so neutral, and I don't notice any veil ...
For me the HD 800 soundstage is too wide, and HD 650 soundstage is just on perfect width and depth for me. The bass and vocal is more bodied on 650's too.
It is our luck that Sennheiser doesn't tag HD 650's price with HD 800's / 700's price tag
HD 650 - always singing always understanding what our ears want (not to forget the amps and dac it paired with ) super special thanks goes to the DAC and AMP it paired with
Edited by ExCelciuS - 12/2/13 at 6:28am