Now...here's a side by side render of Miki 4 and Miki 3. I'm not seeing anything terribly different here besides the skin color treatement (the Sub Surface Scatter and EZ-Skin seem to lighten the body color).  They're using the exact same texture by the way.

 

So...if you could maybe post a render of what you're seeing so that we all see the same thing, I can tell you if you need to post a bug report or not.