I shoot more sports than wildlife and find that every sport like every wildlife shoot is different. Like bears vs birds, football vs volleyball brings a different set of challenges, settings, and practices. I don't know if I will every own a "flagship" camera but I do believe that sports photography can be successfully captured with many of todays DSLRs and MILCs. Yes, I am sure that a Z9 might increase my keeper rate some but I just don't feel like my Z6ii is failing me in sports photography now.