Leasing Porsche 991

Dear Forum, I would like to have this 991 leasen.http://m.mobile.de/portal/index.html#Car/DES/192232719 But the Porsche used car leasing conditions are relatively expensive compared to my identical X5. How expensive would it be, or what value could I achieve for the car if I sold it after 24 months with 40000 kilometers. How much discount could I get now for the vehicle Or would a leasing of an independent company be cheaper?