Code can free us from the limitations of tools within a grading software and create strokes that otherwise would not be possible.
It can be difficult to objectively judge the quality of a LUT being provided when applied to real-life footage. For me personally, I think the easiest way to analyze a LUT is using a Test Chart.
Free Sample Footage
Blackmagic Pocket Cinema Camera 4K
Blackmagic RAW: 5:1
Resolution: 3840 x 2160 pixels