I replaced a 3 ltr diesel Mercedes S class ( my 8th one ) with a IM5 LR ....
Ride is slightly firmer , seats more comfortable. Panel fit general quality is comparable , very surprising.
Running costs , not in the same ballpark . Not having to refuel , the wait and making time to do it. Roadtax 25% liable to drop substantially as the Merc tax loading is going to increase . Load capacity , 125 % better . Range anxiety , what range anxiety I charge twice a month , plus I don't drive more than 200 miles at a time without a break for food/drink/charge on a longer trip . Which I spend around 15 mins route planning for if I haven't made that trip before.
Rear seat room and access in particular as the door is longer an opens wider , great for older passengers.
I have heard people complain about paint finish issues but weather it's because I had a ceramic coating applied , I have not seen any problems there.
Three months in I have not seen the Merc out perform this car , let's see what happens over the next 3 years .