If you consider that Intel's real high end is a pair of Xeon 2687W, at four grands (!), they play this really straight but really, for the consumer performance/price ratio gets exponentially lower the more you climb in the line up..
Intel even has successfully convinced people that the Celeron are crap. I see all the time threads were people ask what to get in a computer to watch movies, or for their mother to play card games etc. I tell people to get a Celeron but they insist on choosing between an i3 and an A10, usually. But the latest one is a 2.7GHz Ivy Bridge, replacing a 2.6GHz Sandy Bridge. Either one of those spanks my 2.9GHz Athlon II X2, though how much exactly I don't know : websites don't bother benchmarking low end CPU.
Biggest bang for the buck is to be found in those Celeron (some Pentium G models maybe match them), they have a strong single thread performance - I wonder if they beat the AMD FX on that front
As a quite rough estimate, let's say Celeron has 10% the perf of the high end Xeon pair, in highly multi-threaded stuff (taking ivy vs sandy, clocks, cores, HT vs no HT, small performance hit of using two CPU and ECC and/or registered..). The Xeon pair is about 10x more powerful, and about 100x more expensive.