I rented it for beta testing on the D750 during my vacation to see how useful it can be for my work. Messinian Gulf, Methoni Castle, Voidokilia and many more. In total, about 650 clicks. All with this lens. From 1/4000 and absolute light to 30" and absolute darkness.
Sturdy and compact construction. It has fast AF, but it failed in extremely low light. I gave it to focus on a rock at 200 meters and it focused on half a meter.
The distortions, even at the edges, are small and easily correctable, as well as the vignetting.
Although there are several high-quality primes out there, the flexibility of focal lengths covered by the 14-24mm lens, I think, puts it high on the list for both outdoor and indoor use, from a building to a landscape.

Apart from sharpness and color quality, this lens is worth its money because it manages to tame the distortions that a wide-angle lens like this could have. Anyone who tries it indoors will appreciate its value even more, especially professionals.
The downside for me is in tests I have done outdoors against the sun, it creates flares and generally unpleasant reflections that are difficult to correct even if the sun is barely out of frame, despite being advertised otherwise. For example, Nikon's 24-70 2.8 has much better performance against the sun, as do other quality Nikon lenses that I have tried.

I would not recommend it to beginner hobbyists. For hobbyists who do not have much experience, I would recommend thinking carefully before buying it, considering what they want to do, as wide-angle lenses rely on field curvature, causing objects to be pushed away, especially in the center, and thus often losing the sense of the initial scene, what we see with our own eyes before lifting our camera to take a photo.