Yes I agree, the book is really quite good. Greg Cox fills in some background (names, motivations, context) quite well and his prose isn't the usual monotonous drone that many of these mass-market adaptations are...I also recommend the "Man of Steel" Art-of/Making of book...rivals the recent Marvel ones in going behind the scenes with production art and commentary...some great world-building here....the folks behind this movie really wanted to present something unique and man....did they!
Just saw this again last night....it is by far my favorite genre movie in a long while. Not "better than" all of the recent similar releases, just so well-done that I'm seeing something different and terrific with each viewing....
Here's a link to what I consider one of the best reviews/commentaries I've read about this movie...and I agree with the writer wholeheartedly.
https://m.newyorker.com/online/blogs/movies/2013/06/man-of-steel-superman-and-the-superego.html
I can't wait to see where they go next with this....