I'm now around 104-105C and no engine fan activity after a new thermostat in my '12 MCS
(N18). No fan activity after switching off now, either!
Before the new 'stat it used to stay on 107-108C with the fan switching on as soon as the car warmed up (as well as ~1min after switch-off). It was a 'feature of the car' or 'they all run hot' according to the techs...(I didn't accept that and took it back to the dealer, four times.)
I've been using an ELM 327 derived OBDII scanner (Ebay) connected to a laptop running Easy OBDII software to monitor the engine temp.
NAM people are experiencing some engine fan 'running-on' activity after a spirited drive in hot weather (but I wasn't happy when mine did this in our present UK climate and
featured as soon as the car warmed up). They seem to think 103-107C is a 'normal' temp range (217-225degF) for the R56 MCS
I only noticed the 'running-on' at first; the radio masked the other fan activity.
Hope this helps.