We are talking about base prices:
BMW M5: 102,700 euro in germany
Porsche Panamera Turbo S: 204, 813 euro.
I dont know where You take that prices from.
And, yes, you can spend about 50.000 euros for options in each panamera.
Panamera Turbo 170,896 euro
Panamera S 117,035 euro
These are declared base prices by companies.
For Sure Panamera Turbo S is faster than M5, but hell, its twice the price.
For similar money You can take Panamera S or Panamera Diesel: 98,031 euro.
So Diesel is even closer to M5 price ;)
And for sure, it is faster on track and on stright line.
Oh, maybe BMW will create a Super M5 "power pack" and will sell them for 200k euros, then yes, you can compare it to P. turbo S.
im talking about similar prices car.
Why You want to compare Turbo S to M5, wehn Panamera Diesel is the colosest to it's price from all panameras.