It really depends on your driving style. You will be fine with the 740ix and probably never really want for much more if you are not a super aggressive driver with a heavy foot. Our I6 Turbo in the X5 is enough to get it around fairly quickly, that car is a bit lighter than the 7 but the tune is also not as high as the 2020 740ix.
That being said the 750 is a different animal and its effortless. When I drive the x5 and the 7 back to back its a pretty stark difference between the two.
Especially if you compare the 740ix to the E63s, that car is a beast and will make the 740 look like its standing still, its almost 2 seconds faster to 60.
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