Gentlemen - I've had a few flags about this thread.
There will be some who see the HD800 as superior to the K812. There will be others who see the K812 as superior to HD800. There is no right or wrong - just preference.
Personally - I really enjoy both - and I say this as both an enthusiast and a reviewer. Each has its strengths and each has its weaknesses.
Preference is subjective. It is OK to discuss, but can we please stop this current...