Takeover Sixt company car: good offer?

Hello together, on 01.01. I start with a new employer and then need my own car, because my new employer generally does not provide company cars (compensated by salary). I think if I should buy my current company car, which I put together at the time: – Skoda Superb Combi Sportline (DSG / 272 PS / 4 x 4) – First registration 10/2019 – at the end of the year approx.16.000 km – Navi Columbus, ACC, DCC, Canton, camera, electric tailgate, electric seats, i No. Winter tyres on aluminium as well as other small extrasList price was 54,825,- €. Sixt now offers me to buy the for 36.570,- €. So about 18,000,- € less than then list. I plan to drive the car like my private car at that time until it is flat (that was the case after 13 years and 325,000 km). What do you think? Is the offer of Sixt fair? Greeting, Karl-Heinz