I do not own the Nikkor 14-24. (I have also heard so many praises for this lens, that it might be a bunch of crap, so one will buy it.)
I have the older D version of a Sigma/14mm/3.5. My take, it's Ok, maybe good on 16mp - 24mp, depending on careful composition. (The lens is a compromise, not a bread winner.) There are several 14's in the "Low Price" category:
Samyang
Rokinon
Vivitar
Sigma 3.5 or 2.8.
Probably others
If say the Samyang or other is an improvement on my old Sigma, I'll play & spin the wheel. Nikon's 14-24 has been on my NAS list forever, but I sometimes take issue when the contents of my carry sack costs more than a good used car.
Has anyone explored the bottom end of low cost 14mm's and has an opinion?