I have read the 92's were a bit faster than the later models.
You should search the forums for 500e and you will find tons of posts with lots of great information on these cars.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.