Barefeats has some iMac/laptop benchmarks but I don't recall the versions. Often iMacs are faster than laptops and 17" MBPs are faster than 15" MBPs, probably because of the ease of engineering heat removal in larger boxes.
Note that all kinds of things affect speed testing, such as the fact that some boxes may be engineered to over or under clock in certain situations. It takes careful analysis by the testers to make sense of speed data. IMO BareFeats seems pretty good.
-Allen Wicks
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