Re: DT880 vs. HD600 -- First impressions aren't always lasting impressions...
On first listen, the HD600s struck me as the clear winner. Now I'm not so sure. The DT880s have the wider, more open soundstage and more natural sound.
Bass on the HD600s hits a little harder, but not necessarily better. I threw some AC/DC at them, figuring the HD600s would smoke the DT880s. That was not the case. Adjusting for the HD600s volume gain, the DT880s hung in there, providing just as rousing a performance as the 600s.
The HD600s give the leading edge of a guitar strum or drum kick a tad more punch, but the decay is somewhat foreshortened, less natural. Again, it's as if the sound stage is too constricted and a smartly struck note has to hastily exit the stage to make room for the next note to enter. Not enough room for the music to lounge about. Advantage DT-880s. Could it be those cushy silver velour earpads have something to do with it? They seem to invite lounging.
Speaking of those cushy silver velour earpads, a lot has been written on this forum about the 'death grip' Sennheisers are known for.
The grip is definitely tighter than the Beyers, yet not uncomfortable to my unremarkable noggin. That said, the HD600 ear pads have a smaller opening than the Beyers, which CAN be a comfort issue, especially if you wear glasses. There's a lot of contact with the ear, too much really. Call it 'inappropriate touching.' There's more room inside the Beyer's for your ear to breathe. More comfortable to wear sitting up or lying down. Easy to forget you are wearing headphones, especially since the music has a greater tendency to fill the room than they do with the HD600s.
I still have another week to make my choice, but like a closely contested election, the polls have again swung in favor of the Beyers.