After about 18hr of break-in I can definitely say that my ears prefer the sound of the Clear to the sound of the LCD-3. This is running both from my Bryston B100-SST and from the Woo WA6 headhone amp. The Clear has that 'quick' & 'clear'
sound that is my preference compared to the more 'romantic' sound of the LCD-3. Both are amazing in offering wonderful detail and extension at both ends, but the Clear is the sound I prefer.
The HD-650 is more similar to the Clear than it is to the LCD-3. Obviously, YMMV.
Oops........ forgot to add a couple of details. The Clear is supremely comfortable on my head (maybe not yours). Considerably better than the LCD-3 (which did become 'heavy' after an hour+ of listening) and a bit better than the HD-650, which is also excellent for long-term wear.
On the downside, the Clear standard cable is too stiff and tends to kink. I spend too much time walking around and having to 'unkink' the cable. An unnecessary pita.