I don't know if I would call that a spanking. The review is mostly very positive with one big gotcha. That big gotcha plus the high cost of this lens means I would expect few to choose it over the 24-105. Maybe that does add up to a spanking.
Well... Residual Spherical abborations, focus shift, soft @ F 4, and a not so compelling price.. I'll hold on to my 24-105 for a while longer. A lens that continue to deliver.