A major benefit of the V8 over the TTV6s is its useable power in typical driving situations. How often do you actually floor your G90 from a stoplight? Not often, if ever. So 0-60mph times arent telling the interesting part of the problem it solves. Thats's passing power - going from 55mph to 85mph in a blink -- this is where the V8 outshines Turbos handily. The V8 is smooth as silk, sounds fantastic, is durable and far less complicated (less to break), and has maximum torgue right where you are mostly likely to want it. For a big sedan, a V8 definitely wins over the TTV6s.
Depends on what one considers passing speed.
In MT's
2017 comparison test of flagship sedans, they had the 3.3TT AWD G90's passing speed (45-65 mph) at
2.8s. (For the 2020 G90, got it down to
2.5s.)
A tick behind the LS 500 AWD and the 740e xDrive.
Note how well the 740e did in this despite being powered by a T4 due to the torque boost from the electric motors and the 740e isn't exactly a performance--oriented hybrid.
Quarter mile for the '17 G90 was
13.9s (for the '20, got it down to
13.7s).
For the 2015 LS 460 F-Sport, the QM run got
14.2s; the LS 500 was quicker at
13.7s.
So, both the '17 and '20 G90 have a quicker QM run than the '15 LS 460 w/ its NA V8.
Passing situations are no issue for larger displacement turbo engines as their turbos are already spooled up.
BMW will be going to electrification for the next M5.
Purportedly a T8 w/ electric boost for around 750 hp and a pure electric variant w/ over 1k hp.
Sure, Genesis won't have something to compete against the T8+boost, but a T6+boost should still provide close to 600 hp, and they will compete, if not beat BMW on the pure electric.
Previously, had hoped that H/G would develop a new smaller displacement T8, but over time, realized that it wouldn't be the best use of R&D.
A T6 + elec boost would provide enough power for all but the ones who are looking for insane power/acceleration and that will come from the electric variant.
Sure, neither will have the garble of a throaty V8, but doubt BMW keeps their T8 beyond the next gen.