tnx.
I do not use IC for rendering but technique in general is the same for all rendering engines...
Some of rendering engines like Keyshot are more focused on "Studio lighting" and simply HDRI or few light are enough for result..
Rendering engines like Maxwel, Vray, Corona... are more appropriate for interiors/exteriors
Unfortunately, we can not get everything in one. IC is great for fast modeling but rendering is not the best option.