The North Face® Ultra-Trail du Mont-Blanc® - Race Report video. Even saying that is quite a challenge. Not to speak of participating in the event. The hype around Mt Blanc is almost as incredible as the trail itself.
BTW I couldn't help laughing when I looked at Kilian's Routes. Most of the courses he has done are labeled 'Level Difficult', but UTMB is 'Level Easy' only. Well, it seems to be too easy for him.