Samsung TVs utilize 4:2:2 chroma subsampling for TVs' regular viewing modes, including Movie mode. But it really is not the best mode to be used because 4:2:2 subsampling creates pixel ugliness -
Sony and other manufacturers have the same thing going on when using 4:2:2. Its not a bug, its how they designed it to be, its more or less normal, but it is still ugly
when it comes down to fine text, lines, and dots on the screen. I can't find the exact thread, but it was discussed on AVS forums in depth..
So, some will advice to use PC Mode, which uses 4:4:4 subsampling, but PC Mode ignores CMS controls in either service menu or user menu, often leaving image under-saturated and slightly increasing black level point. There are also YC_Delay (Chroma Alignment Delay) options, which can be used to improve 4:2:2 pixel ugliness. Setting the delay to 0 is the best option in any mode.
However, the best thing to do is to simply use the Game Mode! Game Mode not only reduces input lag by means of disabling all internal processing, but it also eliminates 4:2:2 pixel issues without disabling CMS calibration adjustments! All you need to do is to calibrate Normal color tone in Standard mode to be just like Warm1/2 color tones - 6500K! Disable dynamic contrast, turn off edge enhancement, reduce sharpness, etc. and you got yourself a non-PC 4:2:2 mode with all calibrations, but no ugly pixels! The end-result is image superior to the one in Movie mode.
I just did that and re-tested all my calibrations - Game Mode retained all of them and slightly increased contrast ratio. Its the best mode to be used on Samsung HDTVs for movies, games, desktop/browser.