Koola does not do arch-viz tho. He does great environments (he’s/was a game environment artist), with close up shots, Depth of field and clever composition. Don’t expect anyone to build an airport with the level of detail Koola put in his small test scenes!
Unreal is still very limited for arch viz because of the weak refraction/reflections and most 3d models are really not optimized for Unreal. Revit/sketchup models must be almost perfect otherwise it’s a plain nightmare to transform them for unreal.
My guess is we’re going to continue to see unreal being used for interior design but for architecture (medium-large scale projects with exterior renderings) it’s not ready yet.
Just out of curiosity, what kind of building you would like to have made in Unreal?