Watch this 1st, then reference the chart below.
https://youtu.be/Yi-_T3vsv-Q?t=1026
It's very good AA. On stills I can easily spot the difference, but as the guy says in motion in certain types of games it will be hard to tell.
Given that the 5700 and 5700XT can't do 4k anyway, it's a good option to have.