It depends on your friends setup, if he was using on 1366 vs 1155 there is a world of difference on SATA II vs III, likewise on 775 vs 1155. The reasons being is due to the controllers used. Sandy Bridges uses the ICH10 where as 1366 and older use Marvell controllers. Those Marvell controllers had issues which resulted with IO and TRIM. The G1 series board Gigabyte just came out with for 1366 utilizes the newest Marvell controllers which do not have those problems.
also note that even if your friend has the Vertex 3 and plugged it into a SATA II port or is not using the latest ACHI drivers performance will be hampered too. 500MB/s on SATA III or 280MB/s on SATA II.