The Olympus 17mm f2.8. Contrast-wise it’s a little bit flat, it’s really not that sharp and it has quite a bit of distortion. However, it gives a great field of view that is both narrow enough to be intimate yet wide enough to allow busier compositions. Thankfully, RAW files stand up to a good bit of prodding, so you can still get some impressive results out of it. For day-to-day snapshots, I prefer it over the 20mm f1.7. p.s. I really like the fingers of the girl below. Quite elegant, no?
[all photos with Oly E-P1 / 17mm f2.8]