If your TV fails to play the file, remux (not re-encode) the MKV to MP4 using a tool like ffmpeg -i input.mkv -codec copy output.mp4 . This preserves quality 100%.
For fans who seek out the format, the draw is often the visual fidelity. The sequel leans heavily into a more polished, "thriller-lite" aesthetic compared to its predecessor, trading some of the first film's starkness for the lush, masquerade-ball opulence of Seattle's high society. Why 1080p MKV is the Preferred Format for Fans Fifty.Shades.Darker.2017.1080p.mkv