I took me ~150 photos to start getting it right.
It is the best camera I ever had but it is more demanding than K-5 or K-30.
some of my settings:
AA filter off
Hi ISO custom : 100-400 off, 800-1600 low, all the rest medium
jpeg Vibrant with Sharpness set to Fine
after taking over 1300 photos I am very pleased with the camera now.
the most still "unknown" area is indoor low light , even with brilliant Sigma Art 35mm 1.4 I am not 100% happy ( I never use tripod so could be that and I do not use RAW , no time) ,
well will work on it and I am sure that will find doable solution.
some of my photos:
Pentax K-3 - a set on Flickr
kind regards
jack