I agree with certainly, the little things I mean actually. For example, https://www.youtube.com/watch?v=-BhQUxKkQtI on this video, between 0: 12-0: 15 seconds, there are linear motions on the edges of books. I am encountered with shadow trembling problems too much, like this video.
This is kind of vague as you don't specify "better quality". The render engine for iClone 7 has been completely overhauled with the addition of Global Illumination and PBR support. You will not get super-photo-realistic rendering and also keep acceptable rendering times without employing a render farm.