Again you are trying really hard to blur the issue. Ignore clean sheets for a second.
Lets focus on that "Shot stopping" statistic:
Over the last five years, Here are Joe Hart's # of saves befforeca a goal average.
2016/17: Torino 1.60 saves per goal
2015/16: ManCity 1.91 saves per goal
2014/15: Man City 2.37 saves per goal
2013/14: Man City. 1.59 Saves per goal
2012/13 Man City. 1.40 saves per goal
Compare the above to
2016/17: Benfica 4.5 saves per goal.
Simply put, there is no year in the last 5 years in which Joe's Shot stopping ability came anywhere close to what we are seeing from Ederson this season.
So you CANNOT frankly be comparing them at all. For one, it seems you haven't seen much of Ederson so you can't really compare, and you are basing your judgement of Joe being better on good memories of Joe against an assumption of a player you haven't seen much of. But when you compare his performances this season statistically to any year Joe has had since he was 25. They all pale in comparison to what this kid is doing this year.
He is having a type of season Joe has never had. Not for us or for anyone else. Statistically Statistically that is.
Make of that what you may :)