Have you ever wondered what lens to get next? I did too, and to narrow the search space a little bit, I first wanted to answer the question: Do I need a wider or narrower lens?
To get some real data to answer that last question, I made a Lightroom plugin that collects metadata from all my photos. It turns it into graphs for different lenses. For example, this is the usage of my 17-55mm lens:
This should suggest that I get a narrower lens, since I have so many photos at 55mm. On the other hand, I am really using the spectre up to 37mm. The conclusion is not clear, but it's a starting point.