I like my AKG K 1000 a lot. If one chooses to make it their primary phone, and focus on finding the right system synergy to max out their enjoyment from this phone, I highly recommend it.
Having said that, I prefer my Qualia 010. Don't ask me why - I'm not the most sophisticated head-fier, and I don't have a golden ear or deep understanding of what I'm hearing. All I know is that sometimes, the phones just disappear and the music feels like it's being plugged directly to my brain, an illusion my HD600, ATH-W10VTG, Sensaphonics, K 1000, SA5k or the borrowed R10 or RS-1/PS-1 never gives me. Each, especially the K 1000, has given me audio bliss, but it really is the Qualia that I miss (right now my phones are being shipped to NY). I guess I just love the texture of the sound, and to my ears, that's what the Qualia does for me.
I wish I were more experienced with gear and could better describe why I prefer my Qualia 010. I know I haven't maxed the potential of either phone with the electronics I have now. And I listen to crappy Jpop music - certainly not audiophile by any stretch of the imagination.
But even having said all that, I'd rather be with my 010 than my K 1000, or any of my other phones, when all I want to do is be lost in my music.