This is my personal opinion...
If the phone is performing to your liking, why are these scores relevant? Personally, I've never ran a benchmark on my phone. I believe it's a flawed measurement of our devices quality. If my everyday use doesn't find me experiencing any issues then I'm good.
Is there are particular reason you're running these tests?
For what it's worth, after some quick research the Geekbench averages at 3302 Single Core and 5337 Multicore. I've seen reports of the Antutu score reaching around 178,000 and Slingshot at 1561.
Personally...like I said, unless my phone is performing poorly, these scores mean nothing to me.