I think, according to the benchmarks, that the 2.93 i7 in the iMac is not as good (by about 10%) than the Sandybridge 2.8 i7.
Still, a great deal. Mine comes today. Revised
benchmarks below
iMac Benchmarks
Mac Performance
iMac (27-inch Mid 2011)
Intel Core i7-2600 3.4 GHz (4 cores) 11648
iMac (21.5-inch Mid 2011)
Intel Core i7-2600S 2.8 GHz (4 cores) 10248
iMac (27-inch Mid 2010)
Intel Core i7 870 2.93 GHz (4 cores) 9123
iMac (27-inch Mid 2011)
Intel Core i5-2400 3.1 GHz (4 cores) 8357
iMac (27-inch Late 2009)
Intel Core i7 860 2.8 GHz (4 cores) 8335
iMac (21.5-inch Mid 2011)
Intel Core i5-2500S 2.7 GHz (4 cores) 7890
iMac (27-inch Mid 2011)
Intel Core i5-2500S 2.7 GHz (4 cores) 7844
iMac (21.5-inch Mid 2011)
Intel Core i5-2400S 2.5 GHz (4 cores) 7241
iMac (27-inch Mid 2010)
Intel Core i5 680 3.6 GHz (2 cores) 6934
iMac (21.5-inch Mid 2010)
Intel Core i5 680 3.6 GHz (2 cores) 6828
iMac (27-inch Mid 2010)
Intel Core i5 760 2.8 GHz (4 cores) 6726
iMac (27-inch Mid 2010)
Intel Core i3 550 3.2 GHz (2 cores) 5922
iMac (21.5-inch Mid 2010)
Intel Core i3 550 3.2 GHz (2 cores) 5854
iMac (21.5-inch Mid 2010)
Intel Core i3 540 3.07 GHz (2 cores) 5681
iMac (Late 2009)
Intel Core 2 Duo E8600 3.33 GHz (2 cores) 4647
iMac (Late 2009)
Intel Core 2 Duo E7600 3.06 GHz (2 cores) 4221
While the improvements aren't as dramatic as with the Sandy Bridge MacBook Pros,