my impression is that the clear coat material could get some improvement. It looks like the clear coat color is much darker and to metallic (at 0% metallic) than expected. Here a comparison of a standard plastic and a clear coat plastic. It could be useful if the clear coat material allow to start with a standard plastic look and adjust it up to a strong metallic effect. At the moment there is a gap between both materials.
Options to control the clear coat roughness and intensity could be very useful too.
in the current preview clear coat is not effected properly by sunlight… yet. So either in the next preview or 2.5 release, whichever happens first, it should be significantly improved.