Tried farming on normal with 204% MF and got nothing... Only did a couple of runs though.
My guess is that the chance to drop a legendary item is something like 0.001 and when you increase that chance by 10-30%... well it's not much you know.
Kamisei the mf in group play is summed and divised equally amongst player.
So his +297% mf were in fact +74.25% mf (if nobody had mf except him) and them mulitplied by another 30% if players were close meaning a +126,5% mf effective.
and then the legendary find with mf is reduced tenfold. he would have had an extra chance of +12.65% to loot a legendary in group play instead of his +29.7%
Now the question is are you 30% faster when you play without mf gear or not ?
My guess is that the chance to drop a legendary item is something like 0.001 and when you increase that chance by 10-30%... well it's not much you know.
Blizzard logics
More Damage = faster and more efficent Killing = more loot.
Like i said, MF is completly useless now... they might as well remove it.
And IIRC MF is a secondary stat? EDIT: Checked, yes it is.
Correct me if i'm wrong.
Edit: Actually there's the Nagelring. It can roll 25-50 MF i think.
Edit: Kevorkian's post wasn't here when I was making this. Cannot delete my post