You could have just as easily said:
"... the C class interior (or the 3series or A4) is worlds better. Not even in the same league."
It's stupefying how poor and sparse the Model S interior is. Setting aside issues of taste (that is, adjusting for the fact that it is a minimalist design) it's just completely out of place in a 100k+ car.
That's why I said "adjusting for differences in taste".
The A4[1] has a very tasteful, restrained design that is also extremely high quality with high end materials. It also is much, much nicer than the Model S.
[1] Low end, entry level Audi.
every high end german car interior is completely customizable. all that wood can be replaced with plastic, or carbon fiber. all the leather can be replaced with alcantera. all the bling bling can be replaced with lightweight alternatives, or just omitted entirely from the build. you can literally change the seatbelt colors on a porsche, or the color of the stitching in the leather.
you wouldn't know this, because you probably never actually shopped for one, you decided on tesla because you like the fact that it's electric and are a fan of the company. there's nothing wrong with this, that's how many buyers of porsche, audi, etc, operate -- but it shows that you aren't really the target market for the german stuff.
http://www.arodmercedesbenz.com/wp-content/uploads/2015/04/S...
But I say this as a millennial with an engineering degree, so I don't really know if the marketers particularly care about my opinion on what is stylish or not.
http://automiddleeast.com/wp-content/uploads/2015/01/AMG-spo...
You don't need to pay anything extra to beat an s-class, based on their website. The slowest Tesla, the station wagon/suv x version on the slowest/lowest end battery (75kwh) was 0 to 60 in 6.0 seconds, beating all model s's-class mercedes. This was the easiest comparison site I could find, the various models of both cars makes it a little hard to pick one spec model to compare. Never the less, the low end tesla suv beat all s class.
http://www.zeroto60times.com/vehicle-make/mercedes-0-60-mph-...
http://www.zeroto60times.com/vehicle-make/tesla-0-60-mph-tim...
The s class interior is nice. My dad has one, so many buttons, but it's smooth, etc. Soon, Mercedes will start advertising that the new s class is not like your dad's oldsmobile, i mean mercedes.