In Corona, you just apply coronafogmtl straight to geometry, no need for a gizmo.(Corona 3d displacement has improved a lot but I still miss Vray 2d displacement.) You will need to play with the corona settings to try to match it, especially if you used vray 2d displacement. Corona's displacement is inferior to Vray's.I use vrayhdri and vraycameras, there still aren't equivalents in Corona.There is no need for a dome light (plug vrayhdri straight into environment) so remember to take into account any multiplier on the domelight.The vrayhdri map works well in Corona but remember the render multiplier doesn't do anything so adjust your overall multiplier accordingly.Vray cameras work fine in Corona, but you might need a coronacameramod to fine tune DOF.Converting a Vray scene to Corona is pretty much a one-click process thanks to the amazing conversion script that comes with corona (I should add that the conversion back to Vray using the script that comes with Vray is also very good should you need to go that way.) Some things to remember though:

Corona renderer car paint