As much as I loved my Nexus 5, the G3 is just straight up a better phone. Better screen, better camera, better battery, better radios. And I prefer the ergos, with the back buttons and the knock stuff (which you can get, at a price, with a custom kernel on the 5)
Yes, the Nexus does have it as far as how smoothly it runs.. The G3 is a little bit more jerky in a couple of spots, but still blazing fast and responsive.
And I was extremely apprehensive about switching.. But a month later, no qualms about swapping out the 5 for a G3.
Now, if the rumors of a 5.2", SD 805, QHD Nexus are true, and they put a decent battery in it, I might be having a similar conversation, but with the G3 in the outs.. We'll see.