How does item rarity/quantity in a group work?

Is it just based on whoever gets the killing blow?

From - http://www.pathofexile.com/forum/view-thread/11707

When in a party, each player in the party after the first gives a +50% item quantity modifier on drops.

Increased Item Quantity
This modifier increases the average number of items that drop from monsters and chests. It does not affect the type, quality, or rarity of item dropped, only the chance that something will drop. There is no cap on the usefulness of this modifier, as monsters can drop more than one item at a time.
The base chance for an item to drop from a normal monster is 16%. This varies between monster types, and special monsters have higher drop chances.

Increased Item Rarity
Increased Item Rarity % modifiers increase the chances of an item being magic, rare, or unique. For example with a total of +100% increased item rarity, you'd get twice as many magic items, twice as many rares and twice as many uniques from normal enemies.
This modifier has no effect on the number or type of currency items, scrolls, or gems that drop.
When in a party, only the modifier from the player who lands the killing blow on an enemy is counted.
If one of your minions gets a kill, the minion's IIR is added to yours and the total is used.

Magic, rare, and unique monsters have an Increased item rarity modifier for drops.

Doh. Looked in the FAQ, didn't look there.

Thanks

One of these days we'll get around to consolidating everything :p until then there's this:

http://www.pathofexile.com/forum/view-thread/92587