Of course it's faster. The Samsung is only a few months old, while the iPhone 4 is just short of a year old. At various times some high-end phones will be faster than others due to the staggering of release cycles. Expect the iPhone 5's CPU to maybe be a touch slower (likely lower clock, but likely more memory bandwidth), but the GPU will be much more powerful than the Samsung's. And then the Nvidia Kal-El based phones will come out by early next year, leapfrogging Apple. And so on, and so on.
Well at least someone realizes that’s the case. It’s the same with O/S’s. Yet for some reason it doesn’t seem to matter that iOS and the iPhone had a headstart on Android and Android powered phones.