The main problem with these lists is that brands have properties that can vary wildly. Using COMO as an example (which you have as "just below luxury") - how can you possibly compare the COMO hotels in London to Laucala Island? Laucala Island should/would fall under your "private" or "ultra" luxury categories. Same with Four Seasons Alexandria vs. Taormina or one of it's other "top" properties. I appreciate the effort put forth, but I always disregard these lists just because a blanket categorization never really works.