The Samsung 6 Series has an okay color gamut, but it’s not considered a wide color gamut needed for HDR content. It has good coverage of the commonly-used DCI P3 color space, but limited coverage of the wider Rec. 2020.
The EOTF follows the target PQ curve fairly well, but all scenes are darker than they should be. The image in ‘Game’ mode is brighter, as you can see in this EOTF.
If you find HDR too dim and want a brighter image, set the Contrast Enhancer to ‘High’, ST.2084 to ‘+3’, Tone Color to ‘Cool’, and Brightness and Contrast at their max in the ‘Movie HDR’ Picture Mode. This results in a brighter image, as you can see in this EOTF. You can also adjust Shadow Detail to ‘+5’, as seen in this EOTF, but this results in blacks that look gray and we don’t recommend it.