Something doesn't make sense here; while I agree conditions can vary from test to test, compare the 2020 750i and the 2020 X6 M50i tests from car & driver. The times seem to be very close to each other despite the 750i weighing almost 400 lbs lighter. So it's as-if the 750i tested too slow or the X6 tested too fast. I assume the X6 M50i has the m-sport differential which can help with the launch, but even if you measure 60-100 speed they are the same..
2020 750i xDrive
C/D TEST RESULTS
Zero to 60 mph: 4.0 sec
Zero to 100 mph: 9.6 sec
Zero to 120 mph: 14.0 sec
Rolling start, 5–60 mph: 5.2 sec
Top gear, 30–50 mph: 2.7 sec
Top gear, 50–70 mph: 3.2 sec
Standing ¼-mile: 12.5 sec @ 113 mph
Curb weight: 4878 lb
2020 BMW X6 M50i
C/D TEST RESULTS
Rollout, 1 ft: 0.2 sec
60 mph: 3.8 sec
100 mph: 9.5 sec
130 mph: 17.1 sec
150 mph: 26.2 sec
Rolling start, 5–60 mph: 4.8 sec
Top gear, 30–50 mph: 2.4 sec
Top gear, 50–70 mph: 3.0 sec
¼-mile: 12.3 sec @ 113 mph
Curb weight: 5255 lb
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