I have driven the C36, but before having driven a 500E so comparing them wouldn't be fair. From what I remember the C36 was as fast at less than legal speeds.

I can say the extra torgue that comes with the M119 engine at highway speeds is very welcome though, nothing like instant trust versus waiting a second or two in the C36.

If you do go shopping, I'm sure you will follow the often given advise that is given here at MercedesShop.

1. Have the car given a top notch PPI.
2. Make sure the car has complete and unaltered service records.
3. Depending on your price range, a low mileage car will sometime qualify for a warranty, the best of coarse being a Starmark, so spending the extra dough is a no brainer.
4. Pick your year, mileage, and color and enjoy the Perma-Grin you will surely receive, as this car is relatively exclusive and still very quick.