I'll break it down why the DT880 is a piece of shit:
-awful shrill piercing highs
-terrible midrange, unnatural and cold. Horrible midrange timbre
-bass light with poor extension
At least with the D2000 it's more of a Grado PS-1-ish sort of presentation where the bass is overpowering but the rest of the headphone isn't so terrible.
Moot point since the Omega 2 crushes both of them.