Is 16 20 better than 20 20 vision?

Yes, 20 16 is better it means you have better than perfect vision

Yes, 20 15 vision is better than 20 20 vision.

But, If it's 16/20, You see things at 20 feet, that people see at 16.

20/20 vision is when you can see things without difficulty from 20 feet away. It's average vision.

yes, if we unlock 50% of our brains because the human mind uses only 10% of it's power for physical purposes if we had 50%, we would be able to see the thoughts of another person.....