Cloth rules, you can get half leather/suade in a 212 but most will spec leather, particularly on 350 examples. I was loaned a 212 with half cloth/suade and thought, thats nice, but I found getting the seat into a good position hard without obscuring the instrument display. Nice cars however....
You see, I don't know about that. Its down on power and up on torque. You'll find it pretty darned fast and so much easier on fuel and quieter too whenever you really rev it.
I had a lot of issues with the V6 but the newer 350cdi's no one is reporting issues yet and none of the 320cdi turbo seal nonsense is a appearing so I think you're in for a treat.
Handling wise, I'll be curious what you say, I had a CLS grand edition and a 212 sport back to back. The CLS felt more sporting with a lower driving position and firmer steering, but the speeds you could take the bends in the 212 seemed very very high...