I've heard all three. I reckon the DT880 sounds closer to the GR07. You also get all ticks for your definition of "Pleasant". The HD600's are more warm and involving sounding with less clarity, good sound-stage that is involving but smaller and not as expansive than the DT880, detailed enough but the DT880 accentuates it, BUT I liked the Senn's for all genres instead of the Beyers. Last point is pretty subjective however so you can decide.
Disclaimer: Heard all three, passed my chance of purchasing the 880 after auditioning it, and sold the GR07. HD580 is a keeper =D
LOL ! I have exactly the same opinion !!
That Said YoYo Joker, you really can't go wrong with DT880 & HD600. IMO HD600 is more "euphonic" with addictive mids but lacks a bit of soundstage and DT880 is a bit "colder" & neutral, more airy with a great soundstage . Both have a very consistent way of presenting music and both are good all-rounders.
Both are great choices to enjoy music
Edited by Sorrodje - 1/21/14 at 11:52pm