Tonga Toast is a personal favorite, but that is also very different from the usual french toast most people look for. I love the Shahi Tukra French Toast they have at Sanaa at breakfast. I also adore the French Toast Bread Pudding they have a AKL at The Mara & Boma, and the version they have at Primo Piatto at Riviera.
I wasn't a huge fan of the Salted Caramel-Apple French Toast at Ale and Compass, but I know other people have raved about it.