Just finished having a play with my nexus 5 and got it all set up now! Liking it a lot so far.
Won't go into the screen area too much again but it looks great imo, only time the screen goes white/washed out is when viewing from diagonal angles, bit annoying but not something I am going to lose sleep over

Compared to my nexus 7 2013 screen, it is a tiny bit less saturated but unless side by side, you wouldn't notice.
Love the design and feel of the device.
So good not having any bloat/crap and gimmicky features unlike some puke worthy skins.....
As expected super fast and smooth throughout, no lags/slow downs like you get with samsung galaxy devices
Not tested the camera out much but it seems good so far....
Speaker is fine, not the best and not the worse, just annoying the placement, constantly putting my little finger over it
Loving NFC, works quickly and really well.
Main things I am missing so far:
- SAMOLED screen and its true blacks and this app!
https://play.google.com/store/apps/details?id=com.greatbytes.activenotifications&hl=en
NLED is just so crap in comparison. Tempted to reinstall the app and just put up with the extra battery drain.....
- lack of control/features for the camera i.e. no slow motion recording, no tap to take a photo when recording video and most of all no 16.9 option (should be added in an update this though, here is hoping they up it to 6MP and not 2MP like before.....)