Yeah, those MTF lines were pretty high. But, it is performing admirably. Better than the 24-105 f/4 and 24-70 f/2.8 I, ever so slightly better than the tamron 24-70 f/2.8 IS, but not as good as the 24-70 f/2.8 II. And that is where it is priced. Granted, it is f/4 and not f/2.8.

Still seems that it should be a less expensive lens. I expect we'll see that in a few months.