Recently compare My old T1 and friend's new K812, very impressive .
1. K812 is a very neutral headphone , its not kind of typical over-damping HD800's "boring" and "lean", but really pure to reflect front-end's sound.
p.s. I don't mean HD800 is a bad headphone, but its' real advantage is some kind artificial "silver tone" rather than that kind of "neutral".
2.K812 slight dry compare my T1, both have rather close size "head-stage", but T1 is more front-staging...