Owning KRK R6 studio monitors, I'm pleased to say that these sound very similar. Very clear and crisp sounding, with nice separation. They are not bass heavy which is nice, but still have a crisp bass end.
In addition to sounding good, they are very comfortable, with memory foam ear mounts. Both left and right ears (left is marked blue and right is marked red) can swivel left to right, and the right cup has 180 rotation too. The cable is detachable with a detachable volume control, which worked well.
Very pleased with the quality of make and the sound. Recommended for any KRK monitor owners out there.