I have found 2 legendary items. The second one I don't remember what kind of boss it was, the first I remember well because it didn't came from any boss. I was in the spider caves act 1 nightmare, "opened" the first trapped body I found and there it was...
Legendary Drops from Normal Monsters: 2
Legendary Drops from Elite Monsters: 4
Total Legendary Drops from Any Monsters: 6
4 of the 6 legendaries were found running 250-300% MF
The rest were either leveling or were from trash, with minimal MF.
I have found 3 more legendaries on top of the above mentioned. But they have been from breakables/chests (weapon rack, and clouds)
My MF gear would generally only be equipped for around 500-1000~ of the elite kills through MF gear switching. Normal mobs would be with little to no MF gear.
Legendaries found: 3
Crystal Fist (ilvl 7 fist weapon) - Normal Act 1
Slave Bonds (ilvl 33 bracers) - Nightmare (don't remember the place)
Boj Anglers (ilvl 39 boots) - Nightmare (act 2)
All items were found from normal mobs