My impressions on my month-old HD650's would support this. They're brighter than my K701's. 
Couldn't let this pass as it would have to be the most outlandish single statement I've ever read on Head-Fi. I've used HD650s for years. When I bought a 702 just out of curiosity, I ran screaming from the room in horror at their brightness. No comparison--none. The 701/702 is a solar flare compared to the nightlight that is the 650.
I'll add my comment that while I in no way think the HD650s are brighter than the K701, I do recognize that they (the HD650s) did have some kind of treble resonance that didn't sit well with my ears, I think around 10k-14k. I posted a thread about it and a few other people agreed with me, so it's definitely not an isolated incident. I had the old version, too, so if anything, the "new version" would exacerbate this problem. Just chiming in with my experience.
EDIT: thread is here: http://www.head-fi.org/forum/thread/511362/not-sure-if-i-like-hd650s-where-do-i-go-from-here
FWIW i didn't find the HD650s to be "veiled" at all, out of the SSMH - sure, they were smooth and laid back relative to Grados, but not "sit at the beach while sipping mojitos" laid back and not "behind a thick velvet stage curtain' veiled.
Your impressions are of course as valid as anyone else's. I can only say that I listen to classical/orchestral music, perhaps the hardest genre to get right (especially massed strings) and I hear no resonance in the 650s; indeed I've found them amazingly smooth and one of the few phones that allows me to ignore the means and just listen to the music. I did however hear a very severe metallic resonance in the 702 (like the ringing of a struck anvil, as I once described it) that caused me to decide not to perservere with burning it in as I knew it would never suit me. Later, out of curiosity about their very flat FR, I bought a pair of 601s and immediately noticed the same resonance/colouration. I have not noticed this effect on any other headphone and I've heard a hell of a lot. Even the Beyer DT880, which I found startlingly bright, did not exhibit such a resonance. I'm mystified as no one else has mentioned this effect, and I can only assume it was some sort of weird interaction between the bowl cavity and my ears (which, however, are perfectly normal in shape). If someone could offer a more plausible explanation I'd be grateful.
As for a treble resonance in the 650 at 10-14khz, it's unlikely as the FR drops off rapidly above 10kh. There is a peak lower down, but no worse than most phones exhibit, and still at a lower level than the output below 1khz. There may be ear/cavity synergistic forces at work here.
