I have now added the review for FS Washington DC.
I would rank the hotels as such:
1. Four Seasons Washington DC
2. Park Hyatt
3. Ritz Carlton Washington DC
4. Mandarin Oriental
5. Ritz Carlton Georgetown
I am making plans to return to DC in early August (still very tentative) but will aim to try one or more of: Jefferson, Hay Adams, St. Regis and Capella.