http://slrgear.com/reviews/showproduct.php?product=1812

Sharpness 샤프니스
The Nikon 24mm ƒ/1.8G performed very well in our sharpness testing. Mounted on the sub-frame D7000, the lens offers excellent performance at all apertures -- there's a hint of corner softness at ƒ/1.8, but at any other aperture, it's tack-sharp across the frame all the way through to ƒ/8.

크롭 바디인 D7000에선 모든 조리개에서 아주 좋다.다만 개방에선 주변부가 약간 소프트기가 있지만 그 외에는 화면 전역에서  아주 쨍하다.

Mounted on the full-frame D800e, the corners are much more problematic: at ƒ/1.8, there is significant corner softness. The corners become dramatically sharper as the lens is stopped down; at ƒ/2.8, the corners are barely softer than the center, and at ƒ/4 and smaller, the image is essentially tack-sharp across the frame.

풀 프레임인 D800e에선 주변부가 상당히 문제가 있다.주변부는 심하게 소프트하다.조리갤르 조이면 주변부가 급속히 나아진다.f2.8에선 주변부가 중앙부보다 약간만 소프트하고 f4이상에선 화면 전역에서 아주 샤프하다.

Diffraction limiting technically sets in at ƒ/8, but you won't really notice it until ƒ/16, where generalized softness sets in -- if even then.

회절은 f8에서부터 보이지만 f16이 되기 전가진 거의 알아채기 힘들다.f16에선 회절이 본격적으로 나타난다.

Chromatic Aberration 색수차
The lens performs very well in this category, presenting only a very slight amount of chromatic aberration. Looking at the sample images, I'm hard-pressed to find any significant evidence of CA, even in points of high contrast in the corners.

이 부분에선 아주 좋은데 아주 약간만 색수차가 보인다.콘트라스트가 강한 부분에서도 색수차를 찾기가 쉽지 않다.

Conclusion 
Nikon's 24mm ƒ/1.8G is an excellent addition to its prime lineup, however most shooters are going to be wondering if it is worth saving a significant amount of money by buying this lens in comparison to the ƒ/1.4 version. The short answer is -- unless you need the ƒ/1.4 aperture setting -- yes. Both lenses provide very similar performance, and while there are some small differences (7 aperture blades here instead of 9 and an extra lens element, for instance) there is no other single feature which makes a clear buying distinction.

The 24mm ƒ/1.4G was released five years prior to the ƒ/1.8G -- making it the only option at the time. Now, Nikon has a new lens that offers great results at a good price point.