UWA are great fun... I too always wanted the 14L, but with the limited use for the FL I could not justify the price tag. Thankfully, I found the Samyang 14mm f/2.8... It may not have AF, but I just use the hyperfocal distances and don't worry about AF at all. One of the sharpest lenses I have ever shot, especially how wide it is. LOVE it! And only cost me $289... lol
With 14mm, you can turn almost anything into something fun. Just walk around aimlessly and point it at stuff and just play with the perspective even on boring subjects. They are fun lenses to use!