[thxbb12]

Regarding the built-in hood: I agree with Kunzite, it's a great feature. I wish other manufacturers would implement it in their lenses.
During my Pentax days, I owned the 15mm f4 limited. I loved its built-in hood. It takes zero space and it's mega convenient.
I always shoot with a hood, but I find the process of attaching/removing it very annoying. For instance, I carry a small bag, but my lenses don't fit with the hood attached. A built-in hood would solve this problem and make it much more convenient and fast.