I've read about less bass, but most reviews I read underlined that there wasn't much difference between the two. Maybe PurpleAngel can bring some light on this if he's around?
A comment on that review point out that the frequency response is of the DT770 Consumer, not Pro. From what I've read, the 80 and 250 models are different by a bit more than just ohm difference, their build is a little bit altered too, bringing those differences in sound.
Ah, interesting. I didn't even know Beyerdynamic even had a line called "consumer"