Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)
The specs are too different to warrant any real comparisons. I bet my 2.2 i7, 8gb DDR, 128gb SSD could beat the iMac in your comparison.