buy new S-Class

Good morning to each other, it’s time. A new car is to be purchased. For days I have been looking for information on the Internet and today I stumbled through your forum. The reason for the whole search is the S-Class in its current appearance. Since I am a passionate diesel driver it is also to become one this time. The qual of the choice is already limited because there are only two diesel models in the current S-Class. I tend to 420 cdi. Unfortunately I have no experience. ng with this engine. How far can I trust the official consumption data? Can any of you help me further with regard to consumption, rideability and smooth running? Furthermore, the question arises normal or long version? Is the surcharge of the long version worth compared to the short version? Will the standard equipment be raised in the long version? Which special equipment can be dispensed with, which one is a must? What I would definitely like to have: Leather Seat Heating / Seat Ventilation Absta ndsregeltempomat Ambientelicht Navigation Parking assistant Xenon headlights Sliding roof electric adjustable seats What else to recommend? Return camera Massagasitze night vision device or are these just technical toys to be able to specify at the regular table? I hope you can help me further and I look forward to your answers. Best regards Wolfgang