The Gunners boss also believes that the Chilean has something that makes him extra special from what he's previously managed.
The Chilean was signed in a big money deal from Barcelona last summer and went on to enjoy an impressive first season in England, scoring 25 goals and being named the club’s Player of the Season.
He was in good form in the win over Crystal Palace last weekend as well, after returning from winning the Copa America with Chile this summer, and despite his development, Wenger insists he can continue to improve.
“He is already better than when he arrived,” he told arsenal.com.
“In his final finishing there is room for improvement, in his final ball he is already much better, his vision is quite good and incisive. He has that desire to go forward and provoke. He is a guy who provokes chaos in the defences because he has a go at you.”
Sanchez has something extra
The Gunners boss has a plethora of exciting wide players at his disposal, with the likes of Sanchez, Theo Walcott and Alex Oxlade Chamberlain all vying for places in the starting line up.
He has also managed a number of exciting players of that ilk in his sides over the years, as it has always been something that an Arsenal side under Wenger has been known for.
He though, believes that Sanchez has something extra to what he’s managed before, saying his style makes him even more spectacular.
“I have had players like that but he has the style,” he added.
“What Sanchez has is that in the first two yards he is lightning quick. He has that explosive attitude linked with his spirit. That makes him even more spectacular. He does not go across, he goes straight. His desire to go forward, to provoke opponents, to run at people, creates danger.”