Hiya all. Been reading the last couple of pages with interest - especially because I've spent a few hours with an HD598, and have owned (for extensive periods) - DT880, HD600, and all of the AKG Q/K 701,702 + K612.
@SunshineReggae - great description of the DT880 vs HD600. I absolutely concur. There is a difference between neutral and natural, and they can go hand-in-hand sometimes, but a lot of people mix the terms up. I very much agree that the DT880 is more neutral than the HD600. It is has more linearity from sub-bass to upper treble (admittedly it still has that treble peak which gives it the brightness), whereas the HD600 rolls off earlier in the sub-bass, and has the mild mid-bass emphasis. But the HD600 has something that the DT880 (IMO) doesn't have - and that is the stunning sense of natural tone and timbre. Instruments sound real. And that is the real magic of the HD600. No other headphone I've heard to date conveys the sense of realism that I've heard with the HD600.
@cswann1 - you're not the only one that hates the "Sennheiser veil" term. I know it mainly was used referring to the HD650 - which definitely has a darker tonality. I get miffed though when people talk about it in relation to the HD600 as well. I think it really came into force when the DT880, K701, and HD600/HD650 were the three kings of the headphone world. Two cans that were brighter than normal (more etched) - but still relatively neutral vs the HD650 which lived a little on the darker side of neutral. I know that with a properly amped HD600 - I never noticed any veil - even when compared with the DT880 (when I owned them).
@kman1211 - good contributions also. And agree on the HD598 vs HD600. Yep they are similar in a way - but that top end on the 598 was just too grainy for me. What do you think of the K612 vs HD600? I always thought the two were quite similar (about as close as an AKG gets to the HD600) when I had both.
@CADCAM - if you get the chance to demo a pair of HD600 you really should. For timbre / tone / realism alone - they are the perfect compliment to the DT880. I very much enjoyed owning both, and would often listen to one or the other in rotation depending on how my mood was. They are a similar family to - but also quite different to - the HD598. Smaller stage, but better imaging. Similar speed/decay - but better far tonality and timbre portrayal. Notice I said "demo" though - as I have a sneaking suspicion (like Mr Reggae) that if you find the HD598 too dull/'veiled' - then the HD600 may not tick your boxes either. If it doesn't, and you want a definite upgrade from your DT880 - the T1 is the next step for you. It's so competitively priced now as well - so IMO worth looking at. My thread on the two is here : http://www.head-fi.org/t/727739/comparison-review-beyerdynamic-s-siblings-the-classic-dt880-vs-the-flagship-t1