So, I ended up getting the LCD2C, and extremely happy I did so far. One note is that my impressions are based on using them with the Reveal plugin and the LCD2C profile most of the time.
Very first impression when plugging them in was that they seemed somewhat, dull. But maybe it was my amplifier that needed some warming up, as well as the headphones since the headphones were new out of the box. Right now, I find their sound extremely comfortable to my ears, and they have that punch I was looking for! Finally, a pair of headphones that can keep up with my music, without crumbling in the busiest passages. It’s able to bring out a lot more of all details in the mix compared to the HD650. Such an engaging listen, I love it!
As for comfort which was one of my concerns, I find them very comfortable, my most comfortable headphone yet, even though they’re also my heaviest pair. I can forget they’re on my head at times, something I couldn’t do with the HD650. Clamping force was too much, and I never found the pads very comfortable either, as their angled inside gives a rather narrow and stiff contact area.
Anyway, this is by no means a review, just wanted to express my appreciation for the LCD2C, and say thank you, as you did give me that first bump in its direction!