One of the worst traits of Sony color is "chroma noise"—muddy, saturated shadows turning purple. Phantom LUTs desaturate the lows in a filmic way, much like Kodak Vision 3 film stock. This makes the shadows look cleaner even at ISO 12800 on an FX3.
Phantom LUTs are optimized for both production and post-production, as detailed in the Phantom LUTs FAQ In-Camera Monitoring (33x): sony phantom luts better
For many creators, the "better" in Phantom LUTs refers to speed. They are often described as a solution for properly exposed footage. How To Edit SLOG3 With PHANTOM LUT's One of the worst traits of Sony color
Sony’s native LUTs tend to clip highlights aggressively. Instead of a smooth gradient into pure white, highlights can look hard and digital. Phantom LUTs are optimized for both production and
The phrase "Sony phantom luts better" applies differently across the lineup:
The biggest tell of a cheap LUT is the highlight handling. A bad LUT takes 90% IRE and slams it to 100% white, creating a harsh, digital edge on a window or a cloud.
The primary reason Phantom LUTs are considered superior is their ability to emulate the ARRI Alexa color science. Color Transformation