I am currently working on a book about Affordable Classics with a chapter on the W113 (and I realize that affordability is in the eye of the beholder!). I've seen on several online auction sites (you can probably guess which ones) where commenters note that the 280SL has a softer / more compliant / less fun-to-drive etc. ride & handling setup. Yet my unscientific survey of suspension components shows no part number-level distinction between the various models. If there's no difference in the key components (ie, bushings, springs, shocks etc.), then there should be no difference in handling.
As I'm really only familiar with the 230SL, I'd appreciate feedback from the group so that I can state the facts correctly.
Thanks,
Lowell