Each of the top goalkeepers has a particular quality to teach me. I look at Diego Lopez, Iker Casillas, Victor Valdes, Gianluigi Buffon... they all have tremendous experience and ability, and have spent years proving they are the best.
It is great that a goalkeeper as good as Iker has said that I could be the best of them all.
Bernd Leno's injury has changed my career. Other great goalkeepers - such as Iker Casillas - have got their big opportunities when the first-choice keeper was injured.
Everyone knows Iker Casillas. We have all followed him being at the top level for so many years. What he has done for the national team is something impossible to equal. But I try and learn from him when we are there,and train the best I can.
When I saw Iker play at the beginning, what most caught my attention is that a goalkeeper of 18 could stand the pressure of the Bernabeu. He had to be very strong.
As for being the best goalkeeper in the world, it's been written occasionally, but I'd never say it myself.
Who is the best goalkeeper in the world? It's always hard to choose because there are so many great goalkeepers.
Paolo Maldini never won, but he was the best defender in the world. Gianluigi Buffon never won; he was the best goalkeeper in the world for many years. But this is the story of the Ballon d'Or.
The role of a goalkeeper is difficult to judge, above all if you haven't been a goalkeeper. It's like me giving an opinion on someone's job without having had any experience in their sector. You start to realise how many stupid things are said and written about goalkeepers.
My relationship with Iker Casillas is very good - he is a great companion.
Iker Casillas is one of those keepers who always seems to be at his best in the really difficult games when he has hardly got anything to do but reacts when needed in those emergency situations.
Iker is a player who is part of Madrid. He's an institution, both in this club and in Spain.
Iker Casillas is a legend, a myth, and myths do not give up just like that.
I regard Buffon as one of the best goalkeepers in the history of football. He is a legend for me, a fantastic man, and an excellent goalkeeper.
You look at some of the top teams in the world that have got the best strikers, and they are looking to buy another top striker. But if you have got a top goalkeeper, you are not often looking to buy another goalkeeper.
I've had ups and downs in my career, and if you look at it as a bookmaker, the odds of me becoming a world champion were never in my favour, but I never stopped believing in myself and never stopped trying.