I think perhaps I went a little overboard with my description of the highs as harsh, and stating unequivocally that they're not higher-resolving.
I really haven't listened to them nearly enough, to tell the truth. I guess what I mean is this: I would hear details I didn't notice with the HD 600 when listening with the DT880. Then, when I went back to listen with the HD 600, they were in fact there. The difference was that the more dominant treble brought them out more - which isn't necessarily a bad thing.
Now I want to go back and audition them some more. To be honest, they're growing on me - as did the T1 with more listening. In fact, I'd say that the DT880 are like a budget T1. They have a very similar character, with the T1 just a little better in every aspect. Conversely, the HD 800 is quite a different animal from the HD 600.
Given their price on Amazon in the US, it's hard for me to find a reason not to get them... Granted, I said that about the AKG K701 last week. Regardless, they're perhaps my number one "headphone of interest" right now.