Hi I have had the 2018 M5 Here:
Then went for the 2019 M5 Comp Here:
Prefer the M5 Comp it does feel tighter and the suspension (i do drive on some shit roads) is more than tolerable , my daughter hates thumps/bangs on bad roads, and has had no complaints.
The new car has these Particulate filters in the exhaust, they have impacted a mile or two on economy.
However this may be down to low miles covered, car bought in March and only done 2870 Miles so far. Brilliant cars both of them, I do miss the CCB I had on the first M5, dust from from the front rotors a real pain.