Well, I can't compare to some people here! Just got my K-3II last week and haven't had much time to play with it. Generally stick to car (and racing) photography but since the K-3II has the built in AstroTracer/GPS, I figured I'd try my hands at some Astrophotography. Talk about a learning experience! Anyway, using the 18-55 DAL kit lens from my K-r body, I snapped these two photos. The first picture is just of the constellation Orion. No AstroTracer in this photo:
18mm, f/3.5, ISO800, 15s exposure
https://flic.kr/p/QTmPGs
Second photo has AstroTracer used and was taken in the same direction as the first photo from an entirely different area of town. Constellation Orion is barely visible at the top. The lights to the south are not actually a city, but the lights of Interstate 80.
18mm, f/3.5, ISO 800, 20s exposure.
https://flic.kr/p/RAfccf