From user:

Comparing UE, Arnold, Vray and MaterialXView that have MaterialX files imported, some materials of UE clearly look different from other renderers. Looking into this issue, we found that colors change because colors with more than 1.0 are clamped with Saturate in the implementation part of OrenNayer, in addition to the influence of the Thinfilm issue, which has already been reported ( 

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If applying Saturate after calculating the coat, the material looks more like the other renderers:

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Steps to Reproduce

See user's report in Description

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Fix Commit33170692
CreatedApr 1, 2024
ResolvedApr 23, 2024
UpdatedApr 30, 2024
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