This was supposed to be a final image, Because this view of the scene isn't supposed to change in the future...
However, I didn't post it in the finished works, neither in the gallery since it's still grainy after 16 hours of computing on a i7 2600k (traditional sampler). There is a 64 m3 volume of water hanging uppon the camera, so I guess this is what slows it up that much and happens to let the image with still lot of unpolished reflections...
I couldn't tweak the lens effects or noise reduction since the lux window just dissapeared after a certain number of hours (the computer was left alone since I was out, so it's not because I was using the computer to do funny stuff while computing).
I'm now running an hybrid path render to make a little comparison, but I guess this method just will give me more fireflies-like reflections.
I'm open to any suggestions technical/graphical
Edit : Forgot to credit http://www.flyingarchitecture.com
for their wonderful 3D models free library.
The three types of chairs ( Ball chair, Eames chair, LC1 chair) were taken from there as obj / 3ds depending on models. I just cleaned them in blender.