The bass on LCD-2 rev2 is pretty much flat from the bottom to the top, measurements on innerfidelity or other sources confirms it... Mids are also pretty flat, very near to ideal. Treble is very nice - not overly bright like with the majority of headphones on the market... But, the most important thing, it's consistent! No painful peaks or harsh sound.
Denon D7000 have pretty unreal boomby subwooferish bass in comparison to LCD-2 rev2. Mids are definitely recessed. Not dramatically but very significantly in direct comparison. Their treble is inconsistent, thin, painful to listen with a lot of music without using crossfeed for example.
I find the soundstaging ability to be very nice with LCD-2 rev2 - it's not claustrophobic at all, nicely deep, wide enough for modern music or jazz (but not classical) but you still get this "coherent/solid/meaty" sound... It's an excellent phone for modern music and I've seen many excited posts about LCD-2 being very nice for jazz too. However, for classical and atmospheric music, you most probably need something with wider and more defined soundstage. T1 should be better here.
I haven't heard T1 so I cannot elaborate but they should be significantly brighter than LCD-2 rev2 and also significantly less forgiving to bad recordings. On LCD-2 rev2, everything (regardless quality) sounds great once you get used to the fact that you hear the bass the way it's on the recording (as I said, the bass is pretty much flat here). It's also very easy to find a suitable amp for this headphone from what I've read here. Not so easy with T1...
I think it will be difficult to decide for you which one to choose... I personally love LCD-2 rev2 for not being overly bright along with their very nice detail (better than on D7000) and overall sound signature. But, maybe, if you are searching for a great soundstage and more versatile performer generally, T1 may be a better choice (I've seen several people prefering T1's soundstage over HD800 by the way).
Edited by RustA - 2/4/13 at 2:19am