I ran act 1 4 times at monster power 4 with 355% MF and got 4 legendary's, 3 bad ones one Immortal Kings Belt. Played maybe 2 hours. I used to get 1 legendary every 3 runs of act 3 in patch 1.04. so definitely much more noticeable.
I dont have great gear but I can kill any elite mob in act 3 only one to give trouble is invulnerable minions and only depending on what kinda mob it is. If its a mob that is going to run away from you its super hard.
http://us.battle.net/d3/en/profile/SwisherSweet-1796/hero/4204921