This article compares the new Pro graphics mode of The Last of Us Part 1 to the Fidelity graphics mode. Both of these are running on a PlayStation 5 Pro console.
The Fidelity mode is rendered at a native 4K and runs at a target of 30 frames per second.
The Pro mode, which is exclusive to the PS5 Pro console, is rendered at 1440p and then uses PlayStation Spectral Super Resolution (PSSR) to upscale to 4K. This mode runs at a target of 60 frames per second.
You can find the video comparison below:
As you may be able to see, the Pro mode can look sharper at times while also running at twice the frame rate.