The denoiser used when Ray Tracing is turned on in its current state results in significant reductions in reflection clarity, shadow accuracy, and ambient occlusion visibility. I have attached detailed specific comparison shots that showcase what lighting effect becomes worse/is no longer present when the denoiser is on. 

Steps to Reproduce:

1. Enter any world with Ray Tracing activated
2. Observe the Shadows, Reflections and Ambient Occlusion
3. Change the Render Method to "Game Path Tracer" instead of "Game"
4. Observe the new visual differences in the Shadows, Reflections and Ambient Occlusion

Observed Results:

With the denoiser on, shadows have a much higher blur to them (making them appear unnaturally blurry) and they occasionally completely disappear when they are of a small size. Their accuracy in the world is also heavily reduced, with them very often appearing disconnected from the object that is casting them. 

Reflections also appear to be heavily blurred as well, and appear to smear heavily when moving throughout a world.

Ambient Occlusion in between blocks is heavily reduced in visibility, and ambient occlusion from smaller blocks like the vine completely disappears after moving a very short distance away from the block.

Expected Results:

1. Shadows should retain their sharpness and detail, and no longer be disconnected from the objects they are being cast by
2. Reflections should retain their near-perfect clarity instead of being heavily blurred, and should no longer smear heavily when moving in the world
3. Ambient Occlusion should no longer completely disappear at a small distance away, and instead be retained at much further distances from the object it is caused by

Having these major issues be fixed would result is a much better experiences for everyone using Ray Tracing in the game, no matter their RTX resource pack. 

Here is a link to the PBR resource pack I was using during my testing: https://www.mediafire.com/file/ngisqn3mkjn4c44/Defined_PBR_v1.1.5.mcpack/file