Currently, I shoot with several camera bodies: K3 and K-5 IIs are my Pentax bodies.
A K-70 would replace the K-5 IIs, mainly due to the newer sensor/processor combination - it would certainly meter more accurately than the K-5.
Plus, the rear screen would give me more flexibility in shooting over both the K-3 and the K-5 IIs....
I know there is some concern over the aperture-block failure issue in the K-30/50/70 line, but that does not concern me - if it happens, drop an M42 adapter in the K-70 and I have my permanent Takumar solution!