It looks fine. The image is plenty sharp enough and I don't see more video noise than I would expect from exporting at only 5Mb/s.
However, it doesn't look like you uploaded a 1920X1080 frame size because if I turn scaling off to make sure I am looking at the proper size and getting the proper quality, It does not take up the full screen.
If you upload a 1920X1080 is will look like this. Play it at full screen on a 1920X1080 monitor with the scaling turned off and it fills the screen.
Perhaps you have scaling turned on? If so, don't do that. Or, export 1920X1080.