It's entirely possible that I am not driving them well; I don't have a great source. Even with an amp, high-bass and low-mid frequencies were just muddy for me. The Ed. 8s are clear, crisp, transparent. (Yay subjective words). My general requirements are that I need closed cans in most places, and these just shine. I've now tested them against several inferior headphones and I kind of feel silly that I have been missing so much in my music.
Anyhow, definitely not saying the dt770s are bad; they were an upgrade from my previous hd-555s, and they did the job well. I'm just noticing so much more with the Ed. 8s. Some of it is sound stage, I'm sure, but general clarity is much better across my (unfortunately prematurely capped around 15.5kHz) frequency range. It's much easier to pick out instruments, blah blah blah.
Forgive my gushing; I've never had headphones to be really excited about before

. (Also please forgive any typos; this is coming from my phone.)