There's an Elseworlds graphic novel about this - Wikipedia says:

Superman: The Man of Steel Annual #3 - "Unforgiven" - Jor-El convinces the Science Council to relocate selected Kryptonians to Earth. Twenty years later, his son must help humans and Kryptonians live in harmony.

It's a long time since I've read it, but as I remember it the Kryptonians run earth benignly, Batman leads a resistance movement, and Lex Luthor is in charge of the police assigned to stop him. Kal-El is caught in the middle, but gradually realises what this is doing to humanity and decides to help Batman.

Review here: http://www.fanzing.com/mag/fanzing16/dcu101.shtml

There was also one where just Jor El, Lara and Kal-El reach earth, but I don't think I ever read it:

Superman: The Last Family of Krypton is a one-shot comic book, published in 2010. It depicts what could have happened if Superman's parents also arrived on Earth.

Review of it here:

http://majorspoilers.com/2010/08/04/review-superman-%E2%80%93-the-last-family-of-krypton-1-of-3/

Marcus L. Rowland
Forgotten Futures, The Scientific Romance Role Playing Game