출처

Sharpness 
For a bright ƒ/2.8 lens that's also an ultra-wide angle zoom, the Olympus 7-14mm comes through with flying colors in the sharpness category for the most part. Though the corners are noticeably soft at ƒ/2.8 the wider you get, the center sharpness throughout the zoom range is tack-sharp, even wide-open. As with numerous other lenses, stopping down some improves corner sharpness -- around the ƒ/5.6 mark was shown to be the sweet spot for the best sharpness across the frame in our testing. Diffraction-related softness is present, but it only really makes a notable impact at around ƒ/16-ƒ/22. Overall, sharpness is really great stopped down, just don't expect crisp corners at f/2.8, especially when zoomed out to 7mm.

샤프니스는 대체로 우수하지만 개방에서는 광각으로 갈수록 주변부가 눈에 띄게 흐리다.중앙부는 전 줌 구간에서 개방부터 쨍하다.f5.6에서 가장 선명하고 회절은 f16-22에서 본격적인 영향을 미친다.

Conclusion 
Though it's still a small collection of lenses at this point, Olympus' Zuiko Pro line continues to impress with high quality performance and excellent build quality. The new Olympus 7-14mm ƒ/2.8 Pro lens steps in as the premiere ultra-wide zoom lens for the Micro Four Thirds system, offering performance and quality for advanced and professional shooters alike. The high cost of the lens -- at around $1,300 -- is certainly a discouraging factor for budget-conscious MFT shooters, but this is, at this point in time, a unique lens that offers a versatile ultra-wide focal length range, a bright ƒ/2.8 aperture, weather-sealing, great build quality, as well as excellent image quality.

다른 참고할만한 리뷰 photozone