Well, I will put this up, but to answer your question:
In this timeline, Germany never sank the Lusitania, and therefore the United States never was a belligerent, although they did supply the Allies with war material, which caused the Great Depression for the US during the 20s. Russia was forced out of the war due to the Bolshevik Revolution, but it was crushed. The German High Seas Fleet broke out of the British blockade in sheer desperation, and scored a moderate victory.
In 1918, the Western Allies tried a major offensive on the Western Front, but failed with the exception of British at Lille. Then, the Germans beat the Allies in Greece.
In 1919, the German offensive began with storm trooper tactics, where small units infiltrated enemy lines. The Germans broke out of the St. Mihel salient and managed to outflank the Allies at Rheims. Eventually, German forces encircled Paris. Around the same time, the German offensive in Italy pushed them far back, and the Germans were sieging Venice. Soon, Rome fell and the Italians surrendered to the Germans to avoid a brutal Austrian treaty. Soon, France surrendered as well. British forces successfully evacuated. The rest of the war was fought in the Middle East, where the British held at the Suez Canal.
Japan benefited mainly because they held out on their own and were basically victors in Asia and the Pacific. Due to the peace treaties, the Allies forfeited most of their Pacific Island possessions and such.
But I don't get why most of the critical items on the Germans shopping list for post WWI weren't achieved (french territory gains, belgium, canada..)