I found that HD600 is slightly bright and the bass slightly elevated if compared to AKG Q701. Compare both cans on JDS O2 combo.When I say bright, it's not like Beyer bright but a brilliance and sparkle sound. Q701 too flat, lack of fun but good for perfectionist and uncolored fan.
HD600 brighter than Q701, really? Maybe it was because the Q701 was leaner in the low end but it sounded brighter to me.