Regarding the story and screenplay why not just go with the official source and the horses's mouth so to speak...
NEXT SUMMER, "MAN OF STEEL" IS COMING TO THE BIG SCREEN. THE FILM IS FROM DIRECTOR ZACK SNYDER AND PRODUCERS CHARLES ROVEN, CHRISTOPHER NOLAN, EMMA THOMAS AND DEBORAH SNYDER. THE SCREENPLAY WAS WRITTEN BY DAVID S. GOYER FROM A STORY BY GOYER & NOLAN, BASED UPON SUPERMAN CHARACTERS CREATED BY JERRY SIEGEL & JOE SHUSTER AND PUBLISHED BY DC COMICS.
Goyer and Nolan told Empire that Goyer came up with the story initially and Nolan then pitched that to WB.