Sorry boys, Kahn is good but by no means is he the best ever. Peter Schmeichel is the best ever by a long way. After him and before Kahn you have any number of keepers: Gordon Banks, Dasaev,Lev Yashin, Peter Cech, Peter Shilton, the list goes on.
peter cech is good but not kahn good, the other i agree, in my opinion yashin is the best following schmeichel but i think kahn would be in my top 5 to play the game as keeper.