Wow. Just had a strange experience. Listening to John Lee Hooker "Sings the Blues", where he's playing acoustic guitar only throughout the album (okay CD). (If you like the blues, you should own this album.) I always assumed that the DT150 were the best headphones (or really good) for this album because it is so driven by vocals. BUT, going back and forth with my AKG K501s and the DT150s, I actually settled with the K501s.
This album has very light percussion, bass, acoustic guitar, and mainly vocals. In relative terms:
DT150: better vocals and bass, but WORSE percussion, imaging, clarity, acoustic guitar, and soundstage than the K501 on this. You might say, well, on a vocal blues album I want better vocals. But the difference is quite subtle. They're both very good in vocals, like 10/10 vs. 9/10.
Chain: Denon CD player, optical RCA out to audio-gd DAC 19 (10th anniversary), to Lehmann BCL on +10 gain.