I got curious after reading Hocky's post. So I measured (crudely, in a bit of a hurry) the handles on my 98 C230 and on the 87 300E. Externally the C handles appear to be about the same dimensions as the 300E - just a bit more rounded on the front and back edges around the door metal. Internally, I haven't got a clue how the mechanicals are put together, and what, if any, differences exist. But the chrome upper shroud IS a nice appearance. Both cars are the same color so it was easy to visualize the effect.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E