Quasimodo, even though this is a lens I have zero interest in buying, the analysis on Photozone was fascinating. Thanks for bringing this to CR forum!
An earlier post referred to the brilliance of the marketing team at Canon. Was that tongue-in-cheek? I hope so. This is a lens looking for a market, we didn't need it, and it would be a horrible shame if it turns out to be a replacement for the more useful ef 24-105mm. Not sure how this 24-70mm f4 can compete against a cheaper, longer lens that in many ways delivers equal or better performance. Seems like a sad new kit lens, especially with the focus shifting problems reported in the review.
Some day, a better version of the 24-105mm would be welcome, say with better IS, less distortion at 24mm, and less "nervous" bokeh. (Love that term, "nervous," as that is exactly the feeling it generates.) But don't chop off 35mm from the zoom range and say you are done!