I think it depends if you give some preference to keepers from the modern era. I'd say that's fair to a point as many of the pre-1960s keepers were somewhat rough around the edges and clearly the current generation are an agile and athletic bunch. In some ways they have adapted to the demands of the modern game - good on the ball, quick off the mark to sweep, fewer aerial battles - whereas the old boys had to be more physical, had to deal with more crosses and had to be more willing to stick their neck on the line.
1950-1960s - Yashin, Beara, Banks
1970s - Mazurkiewicz, Maier, Zoff, Fillol, Shilton, Jennings
1980s - Dasayev, Pfaff, Schumacher
1990s - Preudhomme, Schmeichel, Kahn
2000s - Buffon, VDS, Cech, Casillas
2010s - Neuer, De Gea
Out of that bunch, he's probably in the bottom handful but still on the fringes of the top 20.