Conclusion

The OM System M.Zuiko Digital ED 20mm F1.4 PRO is a very small and lightweight moderate wide-angle prime that makes for a great walk-around lens for everyday shooting.

Its main selling points are its rather unique angle of view, small size and weight, outstanding build quality, and fast F1.4 maximum aperture.

This lens is an outstanding performer optically, proving to be pin-sharp in the centre and at the edges throughout virtually all of the frame, even when shooting wide-open at f/1.4.

Vignetting is a little heavy when shooting wide-open, but sunstars at f/16 are very well defined and flare is not evident even when shooting directly into the sun.

Chromatic aberrations and barrel distortion are well-controlled in both the JPG and Raw files and the bokeh is very nice thanks to the combination of the f/1.4 maximum aperture and 9 rounded and feathered aperture blades.

This lens' build quality is superb, boasting an all-metal build and IPX1-rated weather-resistance that should see it last a lifetime.

All of that attention to detail and lavish construction quality does result in the 20mm PRO being quite expensive - £649 / $799 is quite a high asking price for such a niche prime - although if the 40mm world view suits you better than, say, 35mm or 50mm, then we can't recommend this lens highly enough.

The 40mm focal length and low price means that the OM System M.Zuiko Digital ED 20mm F1.4 PRO doesn't have too many direct rivals.

The Olympus M.ZUIKO Digital ED 17mm f/1.2 PRO and Olympus M.Zuiko Digital ED 25mm f/1.2 PRO take a similar design approach to the Olympus 20mm but offer a slightly wider and narrower angle of view respectively, whilst offering a slightly faster maximum aperture.

There's also the older, cheaper but perhaps crucially slower Olympus M.ZUIKO Digital 17mm f/1.8 and Olympus M.ZUIKO Digital 25mm f/1.8 to consider, too.

Overall, if the OM System M.Zuiko Digital ED 20mm F1.4 PRO is anything to go by, then the new OM System-branded lenses and the camera system as a whole have a very bright future indeed...

Ratings (out of 5)
Design	4.5
Features	4.5
Ease-of-use	4.5
Image quality	5
Value for money	4