1. Patents existing
That is _really_good_ for 1 person. A patent might make life 200% better for that one person, but at the cost of everyone else.
2. Lack of patents
Not so good for that 1 person, it might just make life 50% better (remember he is still going to be first to market). So that is 150% worse in absolute percentages for that one person. However, for everyone else it will make life better.
So the sum of "betterness" is much higher in case no. 2 since you somewhat reduce the improvement that the patent holder has, but that is far outweighted by 6 billion other people having a slight improvement. So society as a whole wins.