I bless all those that buy cars spec'd up to the level you highlight. I buy them secondhand at 40% of what they paid and they are wonderful.
The CL600 I owned also had those seats fitted. The side bolsters inflate in line with the cornering. The backs and base also provide a gentle massage. Whilst offering cooling and heating. It feels odd at first but once you relax into it it becomes very natural. A bit like 600 bhp 2WD and a tyre bill that tingles.
The ML I have at present also has them among a list so long it makes me laugh. Rear TV screens, a Carbon Fibre engine cover (really - did that actually save weight on a monster weighing 2400kgs?), TV, Radar, lights in the mirrors.......endless.
Then one day driving up the M6 the computer that managed the air suspension active stuff took a left and it felt like a morris minor with no dampers. You tapped the brakes and it wobbled backwards and forwards. Thank god for the warranty.
I did drive a G63 and it made me laugh out loud but putting a solid booster rocket on the back of a massy-fergy was never going to end in anything but a ditch. Adding more options to that would be like ignoring the fact that the steering is not connected to the actual wheels in the first place.
So why say this on this thread. I owned two Porsches, both 968 Club Sports, stripped of all options. Most of the modern ones seem more like the MB's I own, deeply over complex. Yet that 968CS was a sublime experience. Didn't need anymore.
