I made a small comparison between all the ray tracing effects there are in Unity. For shits and giggles. Thought you guys might find it interesting (or not).
This here is all RT effects enabled, meaning ray traced global illumination, ray traced ambient occlusion, ray traced reflections (opaque and transparent), and ray traced shadows:
Second one has got RTGI disabled (everything else still enabled). The back wall basically loses the warm light color information that should be bouncing from the chandelier and the fireplace. It's just reflecting the moon light coming through the windows only. Overall looks still somewhat similar, but the other techniques are still doing some heavy lifting here. But the tone certainly has shifted a bit after losing all that warmth.
The third one has got ray traced reflections off. Unless you are directly comparing between this and the original image, you might not even notice it. But, windows are not reflecting the inside of the room anymore. The back wall lost some of its "realism", now it just looks like plastic. Basically if the scene is filled with glass, metal, puddles, etc., you will notice the difference, but otherwise not really.
In the next one, RTAO disabled. SSAO is working here as a fallback. This one has got a quite clear cut difference, but I guess this is mostly just because SSAO looks so bad, fake and just unrealistic. It guesstimates shadow to places where they shouldn't be. It's like some one just put a dark volume to every single corner there is in the room.
And in the next one, probably the least impressive but still quite cool effect nevertheless: ray traced shadows off. Not much has seemingly changed (because shadow maps are awesome) but when you take a look at the floor on the left side, you'll notice that the moon light is missing from there. And when you squint your eyes at the carpet, you'll see that its shadow along the long side doesn't really exist anymore. Ray tracing gives you more accuracy to give you that shadow. But the non ray traced version doesn't look bad by any means either.
And asset quality matters a lot. That carpet and the floor look good in each of those of examples.