Turbidity has wrong behavior in the new Hosek&Wilkie Sky model that generate unexpected and unnatural sky lighting at higher turbidity values.
Turbidity should simulate more cloudy, haze sky by increasing Sun aura, decreasing sky saturation and decreasing Sun intensity. At the moment it do it right only for Sun aura and sky saturation. Sun intenisty stays the same at different Turbidity values. It works even different than in other Octane Sky Models and other softwares with Hosek&Wilkie sky model where increasing turbidity decrease Sun intensity.
At the moment there is no way to control Sun intensity, it shadow intensity and generating more cloudy, ambient like lighting.
Please connect Sun intensity to Turbidity as it should be and as it is implemented in other Octane old built-in Sky Models.