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So you have a 1.15% legendary drop change
say you have 200MF and 10% of the MF works on legedaries

1.15*1.2 = 1.38%

So a incline of 0.23

Meaning:

http://us.battle.net/d3/en/forum/topic/12413271220#2

Every 1000 drops you will get 2 more legendaries,statistically...

Ooh and farming rifts gives a bonus to legendary drops which is addedmultiplicative meaning that MF works beter in rifts!