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"Both the iMac and the Mac mini use Ivy Bridge processors, so neither Mac has an architectural advantage over the other. What's interesting here, though, is how the quad-core Core i5 iMacs perform compared to the quad-core Core i7 Mac minis. Since Core i7 has hyper-threading technology (and the Core i5 does not), it can execute more instructions at once, leading to higher performance.
Here this means that the mid-range Mac mini is faster than the mid-range iMac that's almost twice the price. True, you do get a display and a discrete GPU with the iMac, but these Geekbench results show how powerful the new Mac mini is despite its size."
iMac and Mac mini Performance