Lighting - Steps on Reflective Surfaces

[csdzz]

Hi all,

I have some troubles with stepped reflection on large plane surfaces as below:


The steps are directly visible on the Keyshot scene itself, not only on renderings (even with Tiff 32b). I tried to use a larger hdri or to use individual lights instead, it does not look better. I need to render some close-up views so it will be quite visible.
Is there any trick to solve this issue? Anyone faced the same problem? Thanks