One of the best Micro Four Thirds lenses around gets the MirrorLessons treatment:

To love this lens, you have to love manual focus. From the solid metallic build to thoughtful details such as the de-clicking aperture ring and large, smooth focus ring, this lens is every manual focus lover’s dream.

The absence of electronic components also means that the lens is very precise. It is wonderful to use with either the E-M1’s focus peaking or magnification function, and can focus very close (15 cm) for a near-macro effect.

Street photographers will be glad to know that the lens also features a handy depth of field scale for zone focusing. All the apertures and distances are very clearly marked.

Like I needed any more reasons to crave this lens.