There is absolutely no contest between FIFA and PES nor can a comparison be drawn between them. So what if FIFA have all the licenses and Motson commentating, that's not what makes the game good. In fact, if the gameplay's shit, which as we all know it is on FIFA, then it doesn't compensate for anything. Why we all love PES is because it's truly amazing in the gameplay, realism and overall representation of the sport. When you pull off a defence splitter of a pass it just feels so good to see your front man run onto it. Not like in FIFA where it feels automatic and that you didn't do it. Furthermore, the flow of the game is so erratic, PES flows beautifully like watching a real match. The gameplay, as rightly said, is important to the game as the air we breathe. It'd still be an amazing game if every team had a pink strip, that wouldn't affect the gameplay a bit!
In a nutshell, PES is the closest to footballing perfection on a console we'll ever witness. Light years ahead of FIFA and EA. FIFA fans can brag all they want about their licenses and official sponsors - it'll just never touch Pro Evolution... Konami are geniuses.