No really, look at their skills, performance and behavior on the pitch.
Zlatan is much more complete than Ronaldo imo. He's an artist. Seen the impossible goals he made ?
Also, they're of course both megalomanic, but Ronaldo cries and complains with every single fault and is much more selfish.
@ Sergio : how is Courtois doing ? I can't watch all the matches here... Is he as good as he was with Genk and the national team ? I saw him at the stadium a couple of times and hell what a talent
