It looks like your test turned out pretty well. Great job of matching the scene to the original picture, and I do not think that the noise is really noticable at all. Just recently I began testing some things out with a Cornell box as well, but I have been using Yafray. At this thread another person was doing similar test, and it came up that someone should compare similar scenes rendered with Yafray versus those rendered with Indigo for the same amount of time. If you want to get involved, I am sure that there are many people who would love to see your input, including myself.
Yeah, nice gallery! Looks like you have some experience using Blender. That is a good render of the Cornell box with Yafray too. I appreciate your time.