Well, firstly Germany would have some internal problem since there will undoubtedly be a showdown between the military leaders and the Reichstag, that will either end with the junkers backing down, and more reforms are possible, or the Reichstag is dissolved, and Germany goes all junta.
Germany would become one of the most powerful nations in the World, and right after the war probably the most powerful one. France will be in decline for at least a decade. And there will probably be civil unrest with a more demanding working class showing their strength. Britain will still have a World Empire and the greatest navy in the world. Even in defeat Britain will be strong, but lack influence in Continental Europe. America will be the strongest non- European country, and only grow stronger. Of course there's always a chance Germany is challenged and another Great War will begin. France would probably be quite revanchist, maybe they can get Italy back on her feet and renew the alliance with Britain and a equally revanchist Russia. Japan will still hunger for more territory, and Germany is still the logical target for expansion in Asia with her Pacific colonies nearby. And the German rule in Mittelseuropa, and the colonial rule in Mittelsafrika will probably be shaky, and unstable. If everything plays out right, the German House of Cards could very well collapse.