Am i the only one that thinks it is odd that people try to show lens softness in very small picture? If it is visbile in such a small picture then chance are the 'softness' is due to poor focus, shake, too slow of a shutter or not choosing the correct aperture for the subject matter.
If I had a lens that showed it in a such a small resampled image then I'd take that joker back in an instant. If the 100% crop is soft in the edges then things are different but I still not so sure the easiest way to remedy it is and correction profile kinda like the DxO stuff.