^^ Now, on to jazz.... John Coltrane "Giant Steps" sounds really nice with these headphones.
Jazz vocals? Listening to Betty Carter's "Social Call" is listenable, but not as engaging as with the HD-650s. The detail, again, is great and fun to listen to, but Betty's vocals are missing the warmth I am used to.
A long way to go, evaluating these 'phones.
^^ Now, on to acoustic... Distance, Light & Sky "Casting Nets" is sounding sweet with the HD-700 (I've seen a number of comments about how well these cans do acoustic). Incredible separation of instruments, great guitar tone, with audible sounds of fingers plucking strings (very cool!) and the percussion sounds so natural (a small kick drum?).
D, L & S has a male singer and a female singer; his voice is gravelly (is that a word?) and forceful; with the 700s, her voice is a little edgy / irritating, but I suspect over time my brain will adjust to that. Lately, this is my demo disc, when "civilians" want to hear my rig and with the 650s the vocals are magic. But with the 700s, the instruments are in a whole 'nother league.
I have to keep in mind that it took me weeks of listening to fall in love with the HD-650s and I need to give these cans a real chance.
BTW, I rolled in a new power tube, just to make things more complicated for myself: a Tung-Sol 6520, which has a more pronounced, bloomy upper bass than the Western Electric 421a and it's very pronounced with these 'phones. I am learning that these cans are more sensitive to tube rolling than the HD-650s.