The more relevant information would be if as a result to Model S sales that the BMW 7 series and Audi A8 are taking a hit in terms of numbers of units sold, or if Tesla has just expanded the market segment.
Good question, I would like to know the same.
My expectation is that it is a mix of both.
My quick calculation is as follows:
With a combined sales from Merc, BMW, Audi and Tesla during 2015 in Europe of 29350 vehicles and Tesla Motors selling 10600 we are well past the point where anybody can say that Tesla does not grab significant market share of the big three Germans, aren't we? That is a bit more than a third of the over all sales!
In case someone says this is not significant, my question is: What would be a significant market share, two thirds?
There are two reasons that this hurts German car manufacturers disproportionally:
1. They need sales of these prestigous cars to create their brand awareness and sell more of the ceaper cars as well.
2. They need sales of these prestigous cars as they provide a higher margin compared to the higher production volume cars.
Just to add an other data point:
Last years Model S sales have been about the half of Merc S class sales.
This years Model S sales are almost the same as Merc S class sales.
What will next years Model S sales be compared to Merc S class sales?