Graphically, this is one of the most impressive games in the series. Each of the boxers looks incredibly life-like and move exactly like their real life counterpart. Sharp-eyed gamers will even be able to pick out details such as realistic cloth textures and facial expressions. The fighters even sweat and realistically bruise, which not only help to make the game look that much better, but also give you an idea of where your opponents weaknesses are. The arenas are spectacular to look at, but as is the usual in EA sports games, the crowd looks very flat and detracts from the immersiveness of the entire experience.
When it comes to sound, KK 2003 is packed with the familiar grunts and punch sounds you'd expect in boxing game. The soundtrack consists of the now standard rap and hip-hop songs, but unlike other EA games, none stand out as particularly noteworthy.