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quite opposite, see Mercedes S-Klasse.

s class and model s are models not badges on top of models. But even the mercedez c class have a sports submodel that falls into the S badge paradigm

There are bunch of tech not available on C-Klasse or even E-Klasse that is on S one.

Unless you're Tesla. ;)

Or Audi!

Tesla doesn’t have S versions, just a Model S

Audi as mentioned has S models and they’re legitimately better than their non-S counter parts (S-line package is not the same)

Not for Porsche or Audi.