It doesn't matter if people can tell the difference or not. People already have the perception that PS4 is the stronger of the two consoles. For the average consumer who buys consoles to play some multiplatform games and not exclusives they will hear that the PS4 runs a game at 1080p while XOne runs the same game at 720/900p. At that point they'll just pick up the PS4 simply because if we are given an option of nearly identical products, we will by default go for the one which is just slightly better even if we can't exactly tell how much better it is. This is just human nature.
Last gen a similar thing happened with the 360. Everyone assumed that Xbox Live was just better than PSN even though PSN was free and the difference honestly wasn't that big apart from party chat. But the perception was built and that's why for a lot of the casuals who played things like COD online, 360 was the choice whether or not the difference with PSN was minuscule or not.
