One more note to add. Actually I was quite disappointed by the sound out of the box, because the bass was disorderly, the mid-range was plagued by emptiness and the treble was constricted. I was so disappointed that I voiced my discontent to the vendor, who said it would need 300 - 600 hours of run-in time to exhibit its normal performance. So I keep burning it in using my STS Burn-in CD. To my relief and excitement, HAMT-1 keeps improving and improving. I would say it reaches a settling phase at 700 - 800 hours, making itself an adorable headphone.
Anyway, it may be a matter of personal preference to rank HAMT-1 above HD800, no absolute right or wrong. Do you own both headphones? Let me know how you think. Thanks.