Have been comparing the COP and the DT 990 Pros 250 ohm driven by an E11 and sourced from my ipad, iphone 5 and my pc. In all instances the DT 990 Pro is winning to my ears. Their mids and highs are much more forward and clear although I'm finding myself throwing them on EQ setting 1 to boost the bass just a bit. The COPs certainly get better when amped because switching to high gain makes their higher end come forward. EQ settings stay at 0 for me because of the already adjustable bass on the headphones themselves. Overall though I'm liking both and will be keeping both for use in different listening situations.
Velour pads should be arriving tomorrow so I'm excited to try them on the COPs