Just to give an update here, we have some features in the Engine for the Standard Material that we are looking to expose in the Editor soon
Clear coat: https://playcanvas.github.io/#/graphics/material-clear-coat
Anisotropic GGX Specular: https://playcanvas.github.io/#/graphics/material-anisotropic
Detail maps: eg https://developer.playcanvas.com/api/pc.StandardMaterial.html#diffuseDetailMap
We also have a Shader Graph Editor in closed beta to help with creating more unique shaders for materials. Looking to going to open beta with limited integration with the main Editor
Looking at the link, it appears that we are lacking ‘transmission’ compared to the three.js material.
I leave it to @mvaligursky to talk more on that as he is our rendering guru.
I do wonder if we can come close to that effect with a roughness map with something like this? https://playcanvas.com/project/362235/overview/tutorial-cube-map-refraction