Playing as Norway, I've managed to unite Scandinavia. Several Russian holdings, the entire Baltic coastline is mine except for two Teutonic provinces and the Hansa. Inherited Gelre. I have several contintental vassals, amongst others Oldenburg, Friesland, Silesia and Baden . Integrated Scotland after a long personal union, peacefully annnexed the two north-western Irish provinces. Munster and Leinster are my vassals, as are Northumberland, Wales and Cornwall, all freed from a very weak England.
In continental Europe, it remains "roughly OTL", so to speak. Most major difference that Burgundy, thanks to me freeing Flanders, is reduced to one province.
Thanks to my involvement down in Turkey, Bysantium lives and holds most of Greece. The Ottomans and Mamluks are severly weakened, with many Turkish provinces and all Mamluk coastal provinces in the hands of Castille, except for Jerusalem and Gaza - which belongs to Hungary (!). Northern Africa is completely divided between Castille, Portugal and Venice.
My only colonies are the island of Madagascar and a conquered Ceylon. The colonial race has been utterly crushed for some reason, with only a few Castillian and Portugese colonies.
This game is fun.