There isn't much to add here that the tests don't already say for themselves - the Olympus 12mm ƒ/2 M.Zuiko offers excellent results for sharpness in a quality package. The price might be prohibitive for some, but if you can afford it, you won't be...

I'm a wide angle snob but I must say this lens does meet my expectations. Low distortion, and fantastic image quality out of this lens. One of my favourite shots out of this lens is this one:

Light and comfortable, the 12mm Zuiko is a dream. Feels even better than old fashioned lenses. Sharp from lowest to highest aperture and smooth operation. Very high recommend.

Best image