That sounds suspiciously like you are after the 10-22 on a crop body.
In my experience it's not as sharp. I still have my 10-22 and 7d. But there is no combo with the 7d that matches the sharpness of the worst lenses I've used on the 5d3.
As for the 16-35, it's really sharp in the center with my 5d. It's the corners that suck.