When I first got my LCD2.1 nearly 4 years ago, the leather pads were firm, but thinner than all of their pads are now. Later, I got the LCD2.2, and the black leather pads were firmer, and much thicker. I actually think the sound was overall a bit more distant to the firm pads keeping the drivers further away from the ears.
Now, with my LCD-X, the black leather pads are the same thickness, but softer again--these are close to perfect. These don't seem nearly as heavy as the others I owned, even though they are the same weight.