I'll just leave this here
UI responsiveness
Jesus Fucking Christ Samsung, what the fuck. HTC really nailed it this year with the responsiveness. Thats a huge difference.
It gets worse. The Nexus 5 should be getting spanked. Slower CPU/GPU and an older model.
Nexus 5 vs Samsung Galaxy S5 - UI Performance: http://youtu.be/V0ijg7in0K8
And this here, is sad, but doesn't surprise me at all. The Nexus phones are just ridiculous value for the price you pay. Its absurd. But man, its really crazy seeing a flagship 6 months later struggling to out perform a half price Nexus phone like that.