I've relighted the scene and worked on it. Using min1 max 1000 quality 20 and cutoff 0.01.
Gauss filter 2, light samples from portal light at 9. All glossy samples at 1, except the main metals with are 2 and 3. Rendertime is not that bad, i'll post the result in a few, finishing rendering at 1600x900.
Thanks a lot for everyone's help, getting better.
Max
edit:
here is the render, took 2 hours and half
pretty satisfied with the time/quality, gonna try with lights and a night shot.
I think gauss 2 is a bit too blurred for my taste, its losing eye focus, might try 1.6 or 1.8.
Thanks again for help