1stly, momentum are so light that it is primarily for portable on-the-go audiophile set of headphone, I found the design and finish to be refined and good looking, comfort is relative, I can feel that it is cosy on my ears but at the same time feel secure, comfortable during rush hours of train ride. And, sound quality of momentum is definitely good, it is very refined, the only complain that most people are unable to explain is that the soundstage is rather small, upfront, and quite congested. If you're comparing this with beyer COP, you're comparing apples to oranges. Although I myself walk around with my Beyer COP but i don't think average people would want to walk around with huge big headphone with slight advantage of huge soundstage(btw tonal color of COP is quite mudddy if compared side-by-side with momentum) . So, please get the right mindset and headphone correctly before trying to compare them. Sound quality is subjective too, but most reliable source would be a recommendation from a trained Musician, I am one,