It feels it too.
My previous C216 CL500 felt like it was made of granite.
This was a positive in some respects as it felt very well made.
In other situations, it felt too heavy to move off, especially on an incline.
Whereas the 222 just moves like it is half the weight - and is very good handling too because the weight is lower down.
I think quoted there is only 50KG difference between the two but it feels a lot more.
Ha, the W222 does handle when it's pushed, trouble is it makes the Mrs shout at me at the same time, dunno if that's a common fault??
I do notice an annoying little wobble at the rear over bumps sometime but I'm told it's common and due to the suspension "sitting on bags of air"