In principle the same, however more polished and more fun!! You can choose where to spawn now, 5 set locations or random. This helps grouping up at the start. More vehicles around, slightly less zombies, and powerful guns are harder to come by. You can upgrade vehicles ala Mad Max with guns etc.
Well worth a play again, though you will get killed at any moment, and yes we did shoot each other at times, well once, Jim blew my legs off!!!