This might help. Its a comparison b/t the 4S and Lumia 900, but it might help you realize there's life outside the apple orchard. With the 5 now out, and the WP8 phones on the way, its timely.
INTEGRATE Fitness 411: iPhone Convert on the Nokia Lumia 900: Not an iPhone Killer, but Definitely a Killer Phone
INTEGRATE Fitness 411: iPhone Convert on the Nokia Lumia 900: Not an iPhone Killer, but Definitely a Killer Phone