Your engine temp is the same as mine, and the same as most Mercedes anywhere, I'm sure. That is COMPLETELY normal. I would worry if the fans didn't kick in at 100, and/or the temp rose to 110 or above.
But what I would like to know is why do MBs temp always stay 'normal' just about 80 until after they are a few years old...!?
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)