and a related link
A pretty harsh review of the 5-series MCE. From the first article: "We wonder if BMW engineers are so satisfied with their cars that they come up with projects like this to give themselves something to do. Indeed, their products have been the benchmark for so long that the cars themselves seem to exude arrogance. They are impressive machines, but before monkeying around with the automatic transmission shifters and creating iDrive 2.0, we’d like to see them fix that funky steering."
Notable from the second link is their comment that the new STS is "getting awfully close" to the 5-series in terms of handling and high-speed stability.