For your use-case, it sounds like an A7Rii will do you just nicely. But avoid the A7R (mark one) - it has shutter shock issues compromising sharpness at some shutter speeds, and the IBIS is just so damned useful if you ever want to shoot off tripod- and even on tripod, in the wind with a telephoto lens on a less-than-totally stable base.
I've bought an A7Riii to supplement my A7Rii because of the increase battery life, improved AF, touchscreen and joystick for focus point selection and other little improvements which count for the bulk of my professional work. I don't see any great step-up for landscape, especially not in MF on a tripod- the improvements are mostly ergonomics, it's the same sensor.
The A7Rii is a little fussy and fussy to operate but capable of absolutely outstanding results.
Cheers, Hywel Phillips