The difference between Venus & Serena in terms of greatness
And the difference is: A few points!
If Venus had won the last few points of the Australian Open final, then Venus & Serena would have similar greatness.
Both would have 5 slams each
Both would have 3 different slams
Both would be tied 6-6 in head-to-head
However because Serena won those last few points of the AO final, she now easily beats Venus in greatness
Serena leading 6 vs 4 in slams amount
Serena leading 4 vs 2 in different slams
Serena leading 7-5 in head-to-head
Big difference in greatness when you look at the stats, but EXTREMELY small difference when you think about it! They are seperated by only a couple points, maybe a forehand error at the end of the third set in the AO final.