Did you ever find a solutions for this?
This has been a problem forever with Lumen reflections for me,
Take this test for example:
Screen percentage is 100%. Still all the details with metal looks blurry and out of focus. For rendering, using screen percentage helps when renderimg with MRQ, but metal never gets as razor sharp as it does with Ray-traced reflections (RT reflections are never blurry at any screen percentage). And what about real-time usage?
My Lumen post process settings are all at max, and using max roughness on 0.4 or 1.0 does make any difference at all (the material roughness values are lower than 0.4 anyway).
Somehow I feel I am missing some obvious solution here, as I can’t understand that an engine producing triple-A games has such limitations.