Date registered: Oct 2009
Vehicle: 2003 Lincoln LS V8
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The CL also has a lot more complicated systems (e.g. ABC), which can be phenomenally expensive even on the non-AMG versions.
As for the difference in the way they drive, the CL55 is much more of a (very) fast luxury car than a sports car. The difference between the way a CL feels and the way a C feels is astonishing. Even the C300 rentals I get when my CL is in the shop feel so much lighter and more nimble than my CL, so I'm sure the AMG suspension on the C63 is far more responsive.
I do a lot more long highway driving than track days, so I love the way the CL rides, but if you're looking for a sportier ride the C63 is your best bet.
I haven't mentioned the E-Class because I haven't driven one.