Some things are more than utility.
- Shutter, loud or quiet for instance.
- Magnesium alloy body vs plastic
- Standard DSLR styling vs semi-retro.
On the pure functional side the KP probably only has:
- 27 AF point system over 11
- Superior dust reduction
- Superior shake reduction;
over a K70.
Until proven otherwise the high iso is either equal or marginally better than K70.
Personally, when you have used one of the better bodies, using a K70, K50 type body is quite underwhelming. Also, I would find it very difficult going to the ancient 11 point AF system.
Against the K5 variants and original K3 it also gains:
- wifi;
- flip screen;
- pixel shift;
so depending on where you are currently placed the KP still has plenty to offer.
Howie Be