Universal Settings :

1. Set V-Ray as the current rendering engine
2. Antialiasing: Adaptive DMC / Min=1 , Max=100
3. Indirect illumination: 1° Brute force + 2° Light cache.
4. Light cache: 5000 and Interpolation samples to 5.
5. Color mapping: ‘Clamp output’ and ‘Sub-pixel mapping’ must be off.
6. DMC sampler: Adaptive amount parameter to 1.0 – Noise threshold 0.005

My Final Settings :

1. Set V-Ray as the current rendering engine
2. Antialiasing: Adaptive DMC / Min=1 , Max=12
3. Indirect illumination: 1° irradiance map (high) + 2° Light cache.
4. Light cache: 1000
5. Color mapping: ‘Clamp output’ and ‘Sub-pixel mapping’ must be off.

My Test Settings :

1. Set V-Ray as the current rendering engine
2. Antialiasing: Adaptive Subdivisions (default)
3. Indirect illumination: 1° irradiance map (low) + 2° Light cache.
4. Light cache: 200
5. Color mapping: ‘Clamp output’ and ‘Sub-pixel mapping’ must be off.