2011-2013 M3 with ZCP have an improved EDC + DSC software. There was a BMW press release article reference on the improved EDC (not to confuse with euro MDM). They re-optimized how the EDC uses DSC data to dynamically adapt the damper setting in sport mode. This is no speculation.
"With a suspension lowered by some 10 mm and light alloy wheels in the size 9 x 19 inches at the front and Y-spoke design at the rear, the Competition Package provides further optimised longitudinal and transverse dynamics. In addition, the control of the electronic damper adjustment function EDC including a Sport mode
specially developed for the Competition Package has been precisely adjusted to the chassis modifications by means of map-based control and the driving stability control function DSC."
http://www.bmwblog.com/2010/02/12/of...n-package-zhp/
I am sure there are other 'silent' minor improvements in the last year that the marketing team did not publish.