To be honest its a thing that every champion has in common, I think that most of the best in the world gets really irritated after they lose a match, and I mean everyone, Maybe the level is a tiny bit different, with a bit of poker faces and all that, but believe me if I tell you, most of the best in the world really HATE Losing very much, I remember one time I saw a match of efren reyes when he lost, he really gets upset, maybe you can't see it clearly in his face, but wait for 3 mins, then go check him up, you will see how angry/sad he is, and for that matter , every champion is the same way, but we all know some people can't hide their feelings very good, like Mika or Earl, when you see their face, you know exactly how they feel.
but I think to be a great player, you must hate losing "SO MUCH", or you won't achieve being one of the tops, my 2cents.