Just a minor disagreement.....I'd say the ES compares to the C, the GS to the E. Engines and prices are much closer and I have seen the E and GS tested together in comparos in C&D and MT.
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."