A point about lens testing: The 24-120 Nikon zoom is arguably the worst lens I own and I use it on a cam with a challenging sensor, the D800. When I bought the lens, I almost returned it because of it's relatively lame "actual pixel" performance on the D800 outside the central 1/2 of the lens IC. But reality is the prints it produces still look great even when printed larger, like to 24 inches, and viewed up close. If I had relied on my reaction after initially testing it, I would not own it. But it's range was just so darn useful for travel, I decided to keep it for whenever I wanted an all-around lens on the camera. And so in the end I've made a lot of great images with a lens I nearly tossed as unworthy.