I shoot with Z9 and Z8 and my wife shoots with only Z 8. For an upcoming trip to Africa here are some lens combination we are considering. In all cases 24-120 lenses to cover the wide to short telephoto range.
Alternative 1: 180-600 and either 70-180 or 70-200 (plus TC 1.4 Z). Have not testing the 180-600 with 1.4 but heard it is okay
Alternative 2: 180-600, 800 PF, 70-200, TC 1.4Z. Gets 800 and 1100+ covered very well (better IQ). Adds an extra big lens.
Alternative 3. 600 TC and 100-400 w/ TC. 600 TC is big beautiful lens. 100-400 w/ and w/o TC will cover routine shooting, only need 600 TC for far away subjects and small birds. w/ the 100-400 + TC giving me 560, will mostly use the 600 w/ TC which brings me to the next alternative.
Alternative 4. 800 PF and 100-400 w/ TC. Similar to Alt 3 but lighter weight, a bit less flexible but basically covers the same range.
Here are my thought - I would like to hear yours.
Alternative 1. Lightest weight. could replace 70-200 w/ 100-400 to give me fall back in case the 180-600 fails (breaks).
Alternative 2: Not sure how often I will need to get beyond 600. Will try to back the bag to see how well they travel and how heavy.
Alternative 3: WEIGHT. not sure I want to take that much
Alternative 4: Simplified version of Alt 2. Replaces the 70-200 and 180-600 w/ 100-400 w/ TC (140-560).
How about Alternative 999: sell everything and use my phone