I've been using the PK3 for a few years now, and just a few weeks ago, got in on the PK2 MassDrop. In my opinion, while the PK3 are amazing, if you can hold out for another round of the PK2, for just a few dollars more, it is a much better deal. Those were about $40 off normal price, while these are only around $10 less.
Also, based on my listening preferences, I do find the PK2 to be a tad superior.
Also, based on my listening preferences, I do find the PK2 to be a tad superior.