1. Portraits, 85 1.2L II OR 135 2.0L. Both are stellar lenses.
2. Landscape, easily 24 TSE 3.5L II with ND filters. The 17TSE is superb but cannot use filters. Filters, IMHO, can tone down a burning sunrise and balance out the exposure.
3. Wedding, no experience here with weddings, but obviously the 70-200 2.8L II gives you a great range plus a 50mm 1.2L prime for closer shots!
All of the above if money is not a huge concern. Besides, who needs to retire? Put off retirement a few more years and get that lens.