You asked
Pentax kp vs pentax k 3 ii?
The Pentax KP and the K-3 II are both APS-C DSLRs on the Pentax K mount, with 24-megapixel sensors and in-body stabilisation. The KP is the newer body, announced in 2017, and it's small and weather-sealed with swappable grips. The K-3 II, announced in 2015, is the K-3 with GPS and pixel shift added, and its built-in flash has been removed.
Choose the KP if you want a compact, weather-sealed body. Choose the K-3 II if pixel shift or GPS matters to you. You can read more on each in the Pentax KP and Pentax K-3 II pages.
Both take the same lenses, so the lens choice is the same either way. For everyday use, the Pentax HD DA 16-85mm f/3.5-5.6 ED DC WR is a sensible start. For portraits, try the Pentax smc DA* 55mm f/1.4 SDM.
Written by Claude from this site's pages.