Recently got this camera and used it a number of occasions strictly for video. 
  
Sometimes however I get a grainy texture to it similar to when ISO is cranked up. I upped the curves in Premiere, look at the shirt on the person to the right: 
		 
  
  
I want to know if their are optimal settings for Premiere to use with the GH4 and also when exporting. 
  
Im using the 18-25 lens which is great. 
  
The video - ISO is 200, 5 aperture at 1/50 second, 50 mps sec at 1080p 
  
Here is another video I shot for the leafs which came out with less than stellar quality: 
		 
  
But here it is much better: 
		 
		 
  
What am I doing wrong? 
  
Thanks!