That's the same on rMBP, actually:
This is from Engadget review:
It's product, geekbench, xbench (gpu one), battery life with the same task.
Seeing that I'll be upgrading from 2007 macbook that measures about 700 on geekbench, I don't really mind.
EDIT:
6,288 / 2.4 = 2620
6,812 / 2.5 = 2724...