If you are comparing Winning Eleven 2014 against PES 2014 on the PS2:
If you play the raw ISO on PCSX2, it will look pixelated. To make it look better than your memory: winning eleven 13 ps2 iso better
Why specifically does the ISO (disc image) version matter? Because playing the original disc on a PS2 with a composite cable on a 480i CRT is charming but limiting. Running the Winning Eleven 13 PS2 ISO on a modern PC via PCSX2 unlocks a superior experience. If you are comparing Winning Eleven 2014 against