The separate ground system (diagram #1) has a lot to recommend it, e.g. no neutral current flowing through the parallel path of water pipes as has been a common point for discussion here. The downside is the amount of copper used to run a 5-wire service (or 4-wire plus cable armor) around the neighborhood. I'm not sure if there are sny services of this type still used in Europe. They use the other two systems (diagrams #2 and #3) extensively).
