Its usually a Leadership 9 test unless a canoness or Seraphem are nearby.
Like The Grog said, sure you can do a horde of power armor, but they do not due that much. Unlike Horde IG, you cannot grind a unit down with hidden powerweapons and they have so few attacks.
With IG, you have the numbers to decide between charging to rapid firing. 9 times out of 10, Sisters would be better rapid firing. Heck, IG even gets free frag grenades.
A few years ago on Dakka I did the math on sisters in assault. They are really, really bad. Yes, it is awesome when a big squad rapid fires, but if CC happens, they are in trouble.
Its true that IG will take twice as many unsaved wounds as sisters will in CC, but they also cost more than twice as much.
The only SoB unit that has the number of attacks required to make a decent CC attempt are the wonderful awesome Seraphim. Alas, they are now so overpriced, hard to hide (They are modeled in the air, which can make it difficult for them to have cover or hide out of LOS) and fragile, it is difficult to recommend them.
I would love someone to show me (Battle Reports) that horde sisters could work. But I believe they do not have the punch to not die in CC.
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