Help with my next camera: Pentax K-1 or go big?

[Kjar]

THE SCOOP: Well it's that time. I've reached max potential on my Olympus Em5 mk2. It's an excellent camera, just not great at landscape photography. The 2x crop sensor and low megapixels are a real drag when it comes to pulling out the detail in a scene.

THE SHORT: I'm looking at getting a full frame camera for landscape photography. No fast fps required, I shoot slow and steady. Full frame, good amount of megapixels and weather sealing are my only real requirements.

THE CONTENDERS: I've fallen for the Pentax K-1. For the price, the specs seem unbeatable. Unless you pay more. A lot more. I'm considering saving up and going with the Sony a7r2 or maybe the Canon 5drs.

I'm an amateur, and quite honestly, I will never print a large photo. But hey, I like nice things. What are your guy's suggestions?
Is the Pentax K-1 suffice? Am I just having gear accusation syndrome?

THANK'S!

 

[Ido]

Start from the lenses. It doesn't matter how good a camera is, if it can't be used with the sort of lenses you want.