I have a lot of closed headphones. These are as good as any other closed headphone at this price, in fact, I prefer these to the DT770, K550, UE6000.
The DJ1 Pro have a bigger and airier sound stage of the four headphones.
Treble is refined and detailed but doesn't pierce like 770 and 550, while UE6000 treble is lifeless.
Mids are recessed on all four headphones, but not too much, the DJ1 Pro still has the most fleshed out mids of the four.
Bass is in line with treble, only slight V shape, DJ1 Pro bass hits the hardest and deepest of the four, quality bass hard hitting bass, but still fairly balanced and detailed. If you want more bass than this you are beyond help, go get beats by dre. I think the DJ1 Pro are great headphones to have a fun listen that is still within the audiophile realm.