How do you play HD-movies?

only VLC

vlc + klite codec.

BS player

MPC-HC + k-lite codec pack.

KM player + HDMI cable

Kodi on an android KB2 (and bb2, atv1 and many other HW incarnations!)

VLC on Linux / VLC and K-Lite Mega Player Classic on Windows

plex

streaming via ps3 media server

I use Potplayer. ;)