My only experience with newer MB leather was a sense of disappointment with the leather quality when I test drove an ML about 2 years ago.
On the other hand, I am constantly amazed at the appearance of the leather in my car. The driver's seat gets much more wear so has some creases and the bolster wear mentioned above, but still cleans up pretty nicely.
I am also startled when I get in my car after not driving it for a couple days, and getting a whiff of the leather, which still smells as if it were new. Not bad for a 10-year-old car with 128k miles!