
All the pieces don't fit together perfectly, but there's little doubt that Morrison's Superman increases in strength -- both moral and physical -- as he progresses, and there's an overall character arc that culminates in "All-Star Superman" and gets an epilogue in "DC One Million."
Morrison spends far more time on Superman's later years than his earlier ones, perhaps not surprisingly, since Superman was around for over 20 years before Morrison was even born. But I think it's worth pointing out that when most writers step up to "redefine" a character -- to really make their mark -- they tend to give us a new origin story. Morrison doesn't do that with Superman. Make of that what you will.
Now, where did I put all those Morrison Batman comics?