PS5 better graphics on old games?

With the Playstation 5 comes the feature that you can play PS4 games and supposedly maybe PlayStation 1,2 and 3 games. My question now is whether you can also switch up the graphics settings for older games, since the PlayStation 5 is supposed to be quite powerful and PlayStation 4 games etc. From the graphics, the PlayStation 4 and the PlayStation 4, for example, are now set exactly the PS5 is better then I hope you can understand my question, thanks in advance.

The PS5 will be backward compatible

Ps4 games can therefore be played.

The new Xbox Series X will be more powerful than the Ps5

When it comes to graphics, it always depends on whether the publishers are pulling in and offering to have the best possible graphics.

Of course, it also depends on your screen.

Ps3, PS2 and Ps1 games can be played via PlayStation Now.

How do you know the Xbox series x will be more powerful than the Playstation 5 even though we don't even have official information from Sony itself? These are all just leaks and they don't have to be right.

I'm not a salty or anything, and I know that Sony prefers to focus on exclusive titles, but still. I believe that both will have the same performance.

Not against you or anything.