Today, Primate Labs used their amazing Geekbench benchmarking software and post a summary about it for the new iMac. They ran its tests on the new 21.5-inch iMac and showing that it is pretty much impressive since it has about 10-25% improvement over previous iMac.
For the high-end 21.5 inch iMac, the score is 12447 is little bit high and better compared to 11410 from iMac (27-inch Mid 2011).
It will be very interesting to see what is the results for the 27-inch iMac to come out very soon since it is 3.4 GHZ Intel Core i7 and it is enough power to use.
Check out the picture in the below that you can see comparison for new and previous iMac.