thank you for opinions
This scene was illuminated only by standard indigo sun light. Big window is behind camera and there is pretty much sun.
The sun is a much over saturated in drop place, but I can´t set the more diffused sun.
It seems, setting of the sun a little limited if GPU rendering used. (Use captured simluation no effect etc.)
Rendered by indigo RT
Render mode is GPU path tracing (GTX 960)
render time 8 hours,
reach 4 000 SPP, speed 2750k samples/s.,
Camera agfapan-apx-025D, D65,
No exit portals (GPU)