So I will copy below what I wrote after one day of ownership on another thread (to save me typing it all again) and will try to keep adding until I can't find anything else to add.
Well I have only had the car one day so its a bit early to tell all the differences (obviously). The standard E55K was almost silent out of the factory (a very poor choice by merc in my opinion) So I had work done on my old car to make it sound how it should have done to start with. I was very shocked when starting the E63 as to how loud it is on the initial start and warm up phase. The E63 feels more solid on the road, difficult to explain as the E55K was hardly a lightweight but was lighter. The thicker steering wheel is beautiful and feels very meaningful/purposeful. It feels more planted on the road, again perhaps due to weight, but it can't all just be the weight. I guess it's moved on, an evolution, so it should feel more up to date and it does, more sporty, more alert, sharper and this is taking nothing away from the E55K, it was and still is an epic machine for which I have the utmost respect, it will always hold a special place in my heart. I have not fully squeezed the loud pedal yet but it is clearly a more rapid car than my old car (which was no slouch at all). The one thing I never liked about the E55K was the SBC braking system, it did a great job of stopping the car but was noisy and intrusive.
Well I have only had the car one day so its a bit early to tell all the differences (obviously). The standard E55K was almost silent out of the factory (a very poor choice by merc in my opinion) So I had work done on my old car to make it sound how it should have done to start with. I was very shocked when starting the E63 as to how loud it is on the initial start and warm up phase. The E63 feels more solid on the road, difficult to explain as the E55K was hardly a lightweight but was lighter. The thicker steering wheel is beautiful and feels very meaningful/purposeful. It feels more planted on the road, again perhaps due to weight, but it can't all just be the weight. I guess it's moved on, an evolution, so it should feel more up to date and it does, more sporty, more alert, sharper and this is taking nothing away from the E55K, it was and still is an epic machine for which I have the utmost respect, it will always hold a special place in my heart. I have not fully squeezed the loud pedal yet but it is clearly a more rapid car than my old car (which was no slouch at all). The one thing I never liked about the E55K was the SBC braking system, it did a great job of stopping the car but was noisy and intrusive.