which review or you looking at? if you're talking about Engadget, they also said the Nokia N8 took worst pictures than the Iphone 4
Iphones pre-process all their pictures so it comes out looking more colorful..Nokia imaging retain the same color sharpness
look at comparision between the Nokia 808 and the iPhone 5....the iPhone has more color but very saturated while the Nokia 808 retains the color of the actual image, therefore you can do more post processing on the Nokia images
Most consumers will say the iPhone 5 looks sharper because of the pre-processing of the pictures the phone does..its very magical
one of the forum member has a Nokia Lumia 920, you can ask to take random pictures of the snow, building structures, trees and see for yourself