Thank you.
What I noticed (differences of using internal Kodi player on Kodi 17.6 against Himedia player):
- 4K HDR movies plays fine on both Kodi player and Himedia player;
- 3D bluray - wouldn't know, sorry :-)
- HD audio is not properly passthrough - my AVR receives 2.0 PCM only, although all options are properly set (wrapper passthrough works correctly with all sorts of streams including newest Dolby Atmos and DTS:X);
- Hi-Media player randomly save timestamp of interrupted movie (sometimes it resumes later from the position it was stopped, sometimes it doesn't - very annoying). There is no such behaviour from Kodi player;
- Hi-Media player sometimes pausing a movie during wathing and leaveas me with totally black screen. The solution is to stop a movie and start it again (only from the beginning, because in this case timestamp is never saved) - it happened to me 3 times during 3 week period.