I've only played the first demo on PC, second one on Xbox 360. Not noticed a massive difference with the keepers, Julio Cesar made 1 save for me the entire match (a penalty) and let in 4 goals from 5 shots on target. Neuer spilled a few too and let in 3 from 7 shots.
It's hard for me to quantify how much better it is than the first demo though cos I don't think my PC is a very good gaming machine, it wasn't running PES very well even on fairly modest settings.
Will have a few two player games later on but it feels good, just hope there's further improvements on the goalkeepers on the final release/game updates.