I use a fair amount of film music in my mixes and have done mixes of all soundtrack tunes but I have never made a best of the year mix for film scores. Until now.
As an ambient guy, I lean towards more atmospheric film scores. I'm not interested in the soundtrack for the new Star Wars film or Avengers Endgame. So in my list of 2019 favs there are the usual suspects - Clint Mansell, Max Richter, Cliff Martinez & Johann Johannsson. Along with great music from folks like Hildur Guðnadóttir, Peter Gregson, Stuart A. Staples, Daniel Hart, & Adam Bryanbaum Wiltzie.
One of my favorite film music discoveries of the year is William Ryan Fritch. In addition to the monumental collection of film music, Deceptive Cadence: Music For Film Volume I & II, he released two more film scores in November - Artifishal & Exit 12. All three recordings are available on Lost Tribe Sound - https://losttribesound.bandcamp.com/
Tracklist is in the comments with the film the track is from in parentheses.