I own both the a7III and a K1. They each have strengths absent from the other. For landscape, astro, high resolution images for large prints, the feature set of the K1 is superior. The a7III offers IQ that equals or rivals any other 24 meg sensored body available. It also delivers superb video as well as outstanding tracking AF for stills and video. It doesn't offer any of the astro capabilities of the K1, not even interval shooting or time lapse without an external intervalometer. For video and more casual shooting the a7III has essentially replaced my GH4.
I won't try to shame anyone regarding size and weight of travel kits, and suggest a gym membership. It's becoming more and more difficult to travel with a large assortment of lenses and a couple of bodies, now that TSA in the US is requiring camera gear to be inspected just as laptops and other electronic devices. A real PITA.
Last edited by CDW; 07-10-2018 at 02:42 PM.