Better performance, you can really tell a difference in the display if you go back and forth between the 4 and 5 and I do that. Also it is a world of difference how the 5 feels on your hand compared to the 4. The N4 is a bit wider and feels a lot heavier. At the end of a long day, my hand would ache using the 4 and it felt so heavy I would take the case of. I don't know the actual weight if the two phones, I believe they are close to the same, but the design, not being as wide, being thinner, etc, all seems to distribute the weight of the N5 much better and it feels much lighter than the N4.