I can't really agree with that personally, especially considering the HD 600 tops the DT 150 in all those aspects on my system. The bigger question is what headphone sounds better on what system.
We aren't that far apart system-wise , you have the Lyr 2 , I have the Valhalla 2 , I might be the biggest 6XX fan , that's why I have both the 650s and 600s but I can't deny that the 150 is a higher fidelity headphone.