Hey Chico, thanks.
Yes, I had one and a half day to compare. The HD 800 I received was just how I experienced it in 1k hours.
Tradeoff sounds negative in a way (I know you don't mean it), don't interpret it that way. The K812 is still very neutral and extremely accurate/detailed. To me it wins with midrange and bass making it more universal for more genres (EDM for instance is much better than on the HD 800) but its speciality really shines with anything that is acoustic (or let's say real instruments) and needs accurate reproduction to sound "life-like" (I hate that term, you know what I mean). You'll love it. Drums are mighty impressive with the AKG.
btw: Hifiman HE-560 did get lighter and easier to amp just as Dr.Fang promised at the High End 2013 when I asked him personally so the "next gen" remarks of others are spot on.
I'm still a little on the fence regarding K812 vs HD800.
I see people preferring one over the other on both sides. When Tyll dropped the "tizzy" bomb, people got quite riled up. Jude still hasn't posted anything on them apart form his initial impressions, which were very positive (he also mentioned that he didn't notice any tizziness).
There seems to be a consensus forming that the HD800 is still more detailed and resolving, and has the larger soundstage (areas where it beats most headphones apart from perhaps things like the SR-009, etc.). If the K812 makes up for it in other areas, I guess I'm OK with that. The K812 doesn't seem to measure quite as well, but than again most headphones don't measure as well as the HD800 (detail/resolution and measuring well are sort what the HD800 is known for), so I'm not overly concerned with that.
It sounds like between bass/mids/treble you feel the K812 wins 2/3, with the HD800 still edging ahead with soundstage. Do you notice any upper mid peakiness/resonance on the K812? The graphs almost looked like it shared some of the infamous 2 khz bump found on the x70x drivers.
I know you sort of already said this, but am I correct in assuming that if you could only live with one...you'd choose the K812?
I won't be able to pick either of them up for a while, as I spent those funds on a much-needed PC upgrade. So that gives me time to wait for more reviews/impressions to surface.
Edited by chicolom - 1/8/14 at 10:58am