I’d agree that 8k isn’t going to do anything for most people, and likely not even in the next 3 years, really.
Isn’t the Anthem several years old?
If you felt the need to upgrade, I’d wait until they update... rumored later this year? *shrugs
Or, go for Denon, Marantz, or a Yamaha.
Or if you choose separates, the Monolith HTP-1.