From a friend that owns the X-5, the X-5 Comp lacks some of the hand fitting of the X-5. According to him the X-5 Comp is built to a price point and the X-5 is built to a standard. His X-5 is rediculously accurate, stone reliable, and nice to shoot. If it wasn't so incredibly heavy and capacity challenged I would buy one too, for most US competition shooting Sig seriously missed the mark with the entire X-5 line.