Filmmaker Mode is the one you want. It's specifically set up to disable all "enhancements".

It turns of any features that introduce latency - it will still mess up the colour space/brightness/saturation/... on most TVs.

"Game mode" on my Samsung absolutely does some goofy vibrancy thing to the color balance that is, at least to me, antithetical to watching well-created film and TV.

It also boosts brightness of dark scenes which turns black frames into a horrible gray smudge.