I was almost 100% certain that the issue was relates to my ISP and not the TV itself. Having problems with download speed goes up and down... 

But then I tried some different things myself, and...

Well this is what I found out.

Picture mode Custom and the one on top of Custom and you get this result:

Then if you choose almost any other of the picture modes you get this result 🙂

I did at last, figure out what setting it was making this grainy picture!! REALITY CREATION
so in this case you have to set it in OFF mode.

I also found this link http://www.rtings.com/tv/reviews/sony/x850c 

with a guide to recommended TV settings i guess this also can be used on KD-55X8505C.