Nope not at all. The Denon D2000-7000 are highly sought after head phones for their sound. The TH600 are refined versions of them, but still very much alike. It just depends on what kind of sound you're looking for.
I find the TH600 to be a subtle improvement over my D2000. The highs aren't quite as harsh and the mids are ever slightly more present. Maybe it's only a few percentage better to my ears. Unfortunately, once you past the 200-300 dollar range headphones, diminishing returns hit you pretty hard.
Edited by mkygod - 7/28/15 at 7:26pm