User Haraldinowitch shared a video showing off the opening scene from Grim Fandango on Unreal Engine 5. This video should give you an idea of what a faithful remake of this classic adventure game would look like in UE5.
For comparison, below you can find this scene from the Grim Fandango remaster. This way you can compare them.
As we can see, the fan remake has higher quality textures and 3D models. Additionally, we get 60fps animation (whereas the original intro was locked at 30fps). The fan remake also has better shadow detailing. The only negative is the external decorations. The buildings in the background look bad, although the stairs and road have better textures.
Unfortunately, Haraldinowitch did not make it publicly available. Therefore, you will not be able to run it on your PC. Like many other UE5 fan remakes, this video serves as a proof of concept/showcase video and nothing more.