FWIW, mine is a 2013 Model S and the build quality, including panel gaps, are roughly equivalent to a M-B S-Class. The interior is closer to a M-B E-class in appointments, but the materials and build quality are better in the Tesla (I have owned all of the aforementioned cars).
I haven’t owned any of those models, so I can only go on what others have said, like this fellow.
He was pretty vocal about not liking the interior of his Tesla, at least how it deteriorated over time.
IMHO, it’s an amazing drive.