First time using harvested yeast

[Saunassa]

In the past I have brewed a beer by just pouring fresh wort into a fermenter with a yeast cake from the previous brew
.
Brewed up a hefeweizen Thursday last week and now yesterday, friday a dunkelweizen. Used a new pouch of imperial stefon for the hefe, harvested nice creamy yeast from the krausen last weekend and pitched around 100ml in the dunkelweizen yesterday.
The pouch started after 4 hours and the harvested yeast surprised me because the tilt showed gravity changing after 4 hours. I love that as it makes the cost of a pouch of liquid the same as I usually pay for 2 packets of dry. I had been concerned that the 100 ml would be enough. Shouldn't have worried.

Question is if this is unique to hefeweizen yeast or do others take off as quickly?

 

[hottpeper13]

It seems to me that all of my second generations take off faster then the original pitch. Can't really do a sensory cause the beers are different, but they are all really good.