I recently purchased a Tokina 11-16mm f/2.8 to capture wider-angle images. I had been shooting mostly with my 50mm, which is a great lens, but you can’t capture quite as much with it as you want in certain situations. The kit lens was so inferior to my 50 at that point that I needed an upgrade.
Here are a few examples; these were taken without a tripod on my D3200. I know they’re not photos of the alps at sunrise, but it gives you an idea of the kind of quality this lens is capable of using fairly fast settings without a tripod, and on a DX frame.
Also, if you’re looking to get into Astrophotography, this is a fantastic lens for it. A good friend of mine take stunning pictures of the night sky using this lens on his D7100. You can see some of his images here -> Rajeet Kashikar.
The only drawback is that it does produce some grainy shots – you can probably see that in the photos above. For lower light scenarios, where you can use a tripod, slow settings, and a low ISO, you’re golden. But at just over $400, there is no close comparison