Loquah
Headphoneus Supremus
The K10 is on the same level as HD800, but with a warmer (not bass head) presentation.
Because K10 doesn't have lifted treble like the HD800, the K10 doesn't jump out with the same bell-like clarity of the HD800s, but it's actually just as clear in my opinion (referring to CIEM version) and easier to switch between relaxed listening and focussed attention to details because it's nit as forward with it's detail.
I'm in the exact opposite position to you where I'm trying to decide if HD800 can be a match for K10s, but have listened extensively to HD800s in order to provide the comparison above.
Because K10 doesn't have lifted treble like the HD800, the K10 doesn't jump out with the same bell-like clarity of the HD800s, but it's actually just as clear in my opinion (referring to CIEM version) and easier to switch between relaxed listening and focussed attention to details because it's nit as forward with it's detail.
I'm in the exact opposite position to you where I'm trying to decide if HD800 can be a match for K10s, but have listened extensively to HD800s in order to provide the comparison above.