You wanted a slimmed down 24-70 f/4. How about the new 28-70mm f/2.8? Would you miss the wide end? Willing to live with the vignette and distortion?

I'm thinking this lens would make my wife happy, being wide aperture, and light. Just waiting for the Canadian retailers to realize they need add a listing. (Vistek has it listed, but with 7-14 day uninsured shipping as their only option... nope).