Originally posted by Nicolas06 but that's only valid for jpegs and low light scenes
According to the review on this site, not only for jpegs but also for RAWs (although not as much as for the JPEGs).
As regards the AF, though not as good as K-3's, the K-70's SAFOX X is sure a good improvement over K-30's (and hence K-01's) SAFOX IX+. And I took and still take action shots even with the K-30 (in good light).
But the K-3 has other advantages over the K-70. One of those, for me, is the double SD card slot.
At the end of the day, everyone of us has his/her own needs or preferences, and not necessarily the better built or more expensive body is always and for everyone the best choice. The best choice is, in my opinion, the one that fullfill most requirements at the better price (or at least at the price that one is willing to spend).