출처 http://slrgear.com/reviews/showproduct.php?product=1816

Sharpness 
Despite its very bright ƒ/1.4 aperture, the Canon 35mm ƒ/1.4L II is impressively sharp wide-open, on both full-frame and APS-C cameras. Given our expectations with Canon L-series lenses, we were hoping for a super-sharp lens, and the 35mm Mark II doesn't disappoint -- seriously fantastic sharpness from this lens, and a drastic improvement in sharpness compared to the original model!

On full-frame, the Canon 35mm II shows only slight corner softness at ƒ/1.4, but the center is practically tack-sharp. Stopping down only slightly will sharpen-up the corners, making images super-sharp across the entire frame. We see only minor diffraction-related softness begin to set-in around ƒ/11 or so, but it's really only a noticeable issue between ƒ/16-ƒ/22.

On a sub-frame camera, soft corners are practically a non-issue. Images are tack-sharp across the frame both wide-open and stopped down. The lens is seriously great on a sub-frame camera!

Chromatic Aberration 
Though we didn't measure a "zero" on our chromatic aberration testing, the lens, in fact, does very well at controlling CA. On both full-frame and sub-frame cameras, the 35mm II lens averages very low CA, and when viewing our sample VFA chart images, we see very little CA even in the far corners at ƒ/1.4. There's a hint of green and magenta fringing on high-contrast edges, but it's very, very minor.

개방부터 상당히 샤프합니다.개방 주변부에서 아주 약간의 소프트끼가 있지만 35mm f1.4 중에서는 최고입니다.

저도 현재 빌려서 테스트 중인데 탐론 35mm f1.8 VC와 비교시 개방부터 확실히 차이가 납니다.색수차도 아주 잘 억제되어 있고요.

단점은 가격이라고 봅니다.