The pixel sampling was set to low intentionally, to show the differences clearly. The problem is not that the images above are grainy, both need more pixel samples.

I set the pixel sample so low so it's obvious that one of them will need a whole lot more pixel samples than the other.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.