Research of the right colors has been one of my primary focus during the creation of my HDR environments.
Color calibration is important when it comes to start with a neutral image.
However, calibration is often not truly representative of what we see in real life.
That's why I always try to find the right balance between calibration and true reproduction of the colors I have seen in real life.
Each of my HDR environments are tweaked individually to get an authentic dynamic range and natural colors for best results.