I found this a couple of days ago and thought is was rather interesting, and can give you a great idea regarding what Cycles can do for architectural/still life type renders. The author uses cycles almost exclusively in GPU mode, but since all the features available in GPU are also available for CPU, I thought some people here might be interested.

http://www.chocofur.com/cycles-in-production.html

I still wish GPU was going to be included in "Superfly" (nudge, nudge) - but that's life, and definitely better than no PBR at all 

Edit to add the link 

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