I also find that the rendering of the 3rd image is best. Nice work Martin!
...not sure if it is interesting for you or for other users but for me it is nice exhibition how different can the same scene be...
As you can see here , some users are interested in this kind of test. It would be possible to create a thread dedicated to it.Here is another example of interior.
SweetHome3DExample7 (aAmax:0, gI:path, dB:2, 1200x900 pixels rezised to 600x450)
rendering time: 1h 25min 20.9s 
rendering time: 3h 51min 24.8sTo reduce the picture noise, increase the number of anti-aliasing and/or pixels.
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EnkoNyito
