The Colombian is set to start against Sunderland in the FA Cup on Saturday.
The former Chelsea man joined the Gunners in the summer, and has since gone on to establish himself as the firm number one for the side.
He has already put in a number of impressive performances for them, with the Arsenal defence looking a more impressive unit with him behind them.
Cech's impressive displays have seen last season’s number one David Ospina have to accept a role on the bench this season despite doing well last year.
And Wenger has now highlighted the differences that put Cech just ahead of his rival for the goalkeeping spot.
“I did not take Petr Cech based on the performances of Ospina,” he told arsenal.com.
“Petr Cech was just an exceptional opportunity where it was difficult to say no. If you look at his performances from January to the end of last season, he saved us in many games. “
“We are lucky because he has a top attitude, very intelligent, very brave, very quick. The difference with Cech is that he has less experience and his size. Cech is so tall that when he stretches he covers more surface.”
While Wenger clearly believes in Ospina, he is unlikely to feature much in the first team beyond cup appearances.
His big error in the Champions League loss to Olympiacos has left many questioning his ability, and only helped to further Petr Cech’s reputation in the process.
There is no denying he is a good goalkeeper though, as his displays last year showed, and perhaps a move from the Emirates would be his best chance of playing more regularly.