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Originally posted by ajaya fourm ratings for K70 =8.3 and K3=8.8
And the K-3ii gets 8.6 overall (
Pentax K-3 II Review - Conclusion | PentaxForums.com Reviews). The only difference in ratings from the K-3 is that Value is assessed at 9 for the K-3ii and 10 for the K-3 - a difference which depends on the price at the time of the review. K-3ii would surely score 10 for value at $US650.
For those occasions when you can use pixel shift (tripod shooting, non-moving subjects), the models that have it would edge ahead. The tweaking of the processor on the K-70 gives marginally better results than on the K-3 models on the PF test. But overall there would be very little between the three cameras for image quality.
Really the choice is based on features and price. Price is more-or-less out of the equation with the K-3ii and K-70 only $50 apart, so it comes down to features, and what type of camera you want.
Going from a consumer-level camera to flagship model is not just a matter of saying "This one does A, B and C" and "This one does D, E and F". I went from a K-30 to a K-3. Even putting aside the improved image quality, everything is nicer about the K-3: the feeling of solidity, the quiet of the shutter, the feel of the dials, the number and placement of the buttons, the speed and accuracy of the autofocus, the quiet and effectiveness of the dust removal system, and many other little things. The lighter weight of the K-30 is an advantage in carrying it, but I have got used to the extra heft of the K-3 and it's great with larger lenses. The overall user experience is much better.
For about the same money, I'd say get the K-3ii unless you regard the articulating screen, wifi or lighter weight of the K-70 as absolutely essential.