I'm no expert, and my headphone stable is mid-fi at best, but I'd still say that it all depends on what you're looking for. My HD 650 and D7000s cast a sort of romantic sheen over everything--which you could possibly be interpreting as blurring. I do find the D7000s to be a little more impactful and dynamic with acoustic music, if that's what you're looking for. On the other hand, my K701s really bring out the crispness and detail, which might be more your speed--however, I'd say they're more for clinical listening than for anything else. They can come dangerously close to sounding lifeless sometimes, though proper amping goes a long way towards fixing this. (I really like Headroom's amps with the K701, and currently mate it with a Phonitor.)