Watching a video of VFX artists rate movies where CGI is used to portray dead actors and they all agree Paul Walker in Furious 7 was the best done by far. Many think of this scene when thinking of CGI walker
And use this to see how something is off...but the only reason you notice is because the eye perception is a little offf and the neck doesn't move quite right when he hunches back. But that's not even the main point, the point is that his CGI face work is throughout the entire movie and you didn't even notice because it was that damn good....You prolly saw these scenes and didn't even recognize these are all CGI created and not real