Both the earcups and headbands are more generously padded than the K450. I don't have the K450 with me now and my memories of its clamping force is fading, so can't really offer a very accurate comparison on that, but I dun think comfort too much of a problem with both K67 and K450. I'd say it is similar, if not a little bit improved.
Headphone Reviews and Discussion - Head-Fi.org
by the way Do you think that the comfort is similar or better than the akg k450? Thank you!!!