Does iOS 4.0.2 improve the battery life of the iPhone 4 terminal?

iOS 4.0.2 was released a few days ago and the people from TiPb noticed a small increase in the battery life of the iPhone 4 terminal. The increase is not big compared to the old versions of iOS 4, but they say that the difference is felt. Reading the comments there, I noticed that many people complain about the fact that the iPhone 4 terminal battery is not quite as great as Apple wanted us to believe. Apple said that the iPhone 4 has a 40% longer battery life than the other terminals, even though the iPhone 4 has a screen with 4 times more pixels, a processor with almost double the frequency and double the amount of RAM memory.

I don't have an iPhone 4 for now, so I can't give my opinion, but I know that last year we didn't notice a big difference between the battery life between iPhone 3GS and iPhone 3G. So, how many iPhone 4 owners can say that the battery life is longer on the iPhone 4 compared to the iPhone 3GS?