I wear 41shoes & They are usually a little large for my foot. I've never owned scarpas, so I can't compare directly with the Alico's. But compared to Asolo's, Garmont's and Lowa's, the Alico's seem wider and shorter. Since the lacing doesn't go all the way down to the toe box and they are a little wider, I felt my toes needed the extra length. I settled on a 41.5 and I think they fit better.
I usually wear size US10.5 and after break in they fit great.. but the break in is kinda brutal.. so an 11 would probably have been better in my experience... This is my third pair.