Quote: What it will be used for:
Children (son born on may 2016) - probably about 30% (indor not studio - just simple shots in different houses of family and friends and outdor)
Adult Portrait 20%
Landscape - 30%
Macro and other 20% (as soon as I get some good macro lens - might be manual as I plan to use the distance tubes)
Children at play, probably very little difference between the K-3 and D-70, advantage k-3 with higher burst rate, and more selectable AF points.
Adult portrait.... there's not going to be much difference.
Landscape.... new accelerator and possibly cleaner images , especially with pixel shift enabled... advantage K-70
Macro... pixel shift, the rear flippy screen for low angle shooting or waist level shooting, which also takes advantage to the new phase detect system, gives the K-70 a clear advantage,
Going forward into the future, the K70 is KAF4 compatible, the K-3 is not. Some have suggested the K-3 will be KAF4 compatible, but not anyone who has a clue what they are talking about. (Pentax who do know what they are talking about, has left it off the list of cameras that can be upgraded to KAF4.) My speculation is that KAF4 may make it possible for Sigma and Tamron to get back into K-mount, for KAF4 users. (Sigma has said it is no longer willing to accommodate Pentax's with mechanical apertures.) KAF4 supports an electronic aperture.) I wouldn't purchase a new camera right now without KAF4. I'm considering buying a K-70 as a second body to my K-3, just for all the things it has my K-3 doesn't have.
Plus I love the look of the K-70 silver edition.