I don't know about that real to cgi comparision. I think real photography and cameras diffuse more. CGI tends to be super sharp. Like you said they need to find the happy medium but, being someone who works in the entertainment biz and works with CGI renders I know that artists don't train or work with real arts to find that happy ground. They create super high detail renders that actually shouldn't be high detail. When they did Jurasic Park they found they ahd to actually dumb down their renders and add imperfections like dull lighting, fuzzy renders and smoothed surfaces or people didn't feel the dinosaur looked real enough. Its just more technology to fiddle with. I'm sure they will get there.