I'm a 3-time Scarpa Crux fan (still keep one just for good times, not to destroy) and I love these just as much, though they are not yet as broken in.
I'm not using them so far for their true intended use in mountains / scrambling , etc...still ragging my Crux's for that so this is not a performance review. Its far more superficial: these are just for going out / being seen in town - and they get lots of viewing and questions. They are also much better constructed than the Crux's, and only slightly heavier but w/o feeling clunky or bulky.
That being said, they fit true to size - I wear 11 to 11.5 US and did the metric on that, fits perfectly. They are a tad stiff to start, but they don't hurt - they are just well made and not BS materials. They feel immediately comfortable inspite of the firmness however, so do not let that detract from your decision.
Keeping in mind that my use right now is entirely town / out , I do plan to eventually get them out on rock and such, but first I wanna just have one decent, clean pair of sweet kicks to have in town - and these look better than good for that.