I've had this lens for a while now. Initially I wasn't sure and nearly sent it back, but the more I use it the more I appreciate it. It was a toss up between this lens and the Nikon 14-24 2.8. I decided that the 14-24 was just too bulky and heavy to carry around all day, and that bulbous front glass was way too exposed to damage for my liking, not to say that it isn't an amazing lens - it is - but perhaps a bit too specialised for my tastes as a keen amateur rather than a pro. Having recently tried the 14-24 on my camera it has confirmed that I made the right choice as the other issue with the 14-24 is that although it is 2.8, taking sharp handheld shots in low light was very much hit and miss, whereas with the 16-35 VR I can nail a sharp shot more often than I could with the 2.8. At the end of the day it's horses for courses, if I could afford both, I'd probably have both as they both have slightly different uses - as a pure landscape lens the 14-24 on a tripod would edge ahead in image quality and the extra 2mm is always useful, but as I could only buy one, I'm glad I chose the 16-35 f/4 VR as it is a much more portable lens, takes filters and fits easily in a regular sized camera bag. Being approximately the same size a the 24-70 and 70-300, I don't need to buy another 'day' bag, whereas the 2.8 is huge at one end and simply does not fit into most bags. I'd suggest you try both out on your camera if you can't decide which to choose.
Results are sharp across the frame, and images show great colour reproduction and excellent contrast. If you go out of your way to create it, you can get flare but it is extremely good in that respect. It is a heavy lens if you are not used to the Nikon pro range of lenses but is one of the lighter pro lenses and does not become uncomfortable to carry around all day, even on a D300s with grip, or a D3s.