Nice review, your comments are consistent with other comparos between these cars. Both cars are awesome but I'd have selected the CLS as well, I climbed through a black one at the Winnipeg MB store a while back and really liked it.
I do note that Mercedes gave you the slower AMG car though. There is also an "S' version that shaves off two more tenths in 0-60. Also, the HP numbers are at the rear wheel. Apparently engine hp is closer to 650.
For my money though, I think I'd actually buy the E63S because it's a sleeper by comparison, cheaper, massively fast, and I know where all the controls are.