Sadly that taxbreak runs out in 2022 and until then declines every year, while not being that substantial. It's tied to battery capacity and maxes out at currently 8000€ from the new price. So with a Model S in a base configuration without any features for example you have to tax 600€ per month instead of 680€. That's a 12% reduction in tax burden, nothing that would push me towards a car in that price range, especially if I had to then accept less features for a similar price. For a Model 3 its more favorably pushing it up to 20-25%, but once again, compared to a similar priced gas guzzler, the feature/cost ratio isn't there, even if you compare it to relatively expensive BMWs or VWs.
I'm currently looking for a new company car and own Tesla stock so look at these numbers quite closely because I'd love to get a Tesla, but it isn't cost effective to get one if you can't factor in the gas savings and maintenance savings.