If you can't get the job done in "travel photography" with just the A7R2 + 35mm F2.8 you are not much of a photographer
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Byron Bay, NSW, Australia
http://gallery.me.com/dp1975
None of the above are what I would call travel images.
They look like basic family snapshots.
35mm is often too tight for real travel work.
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¡Viva la Resolución!
http://www.flickr.com/photos/dfpanno/
http://flickrhivemind.net/User/David F. Panno/Interesting
http://www.flickriver.com/photos/dfpanno/popular-interesting/
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I only chose those images to show that the little 35mm at 120g is extremely versatile for almost any travel photography short of extreme examples. Cant capture the Sagrada Famila? it also not going to be much use on the Serengeti plains shooting lions either.
"None of the above are what I would call travel images" Really?
Pic 1 - World Heritage listed Mossman Gorge in tropical far North Queensland in Australia
Pic 2 - Example of its portrait ability, shot in Toronto, Canada on a 4 week trip approximately 15,000km from where I live.
Pic 3 - Canadian Warplane Heritage Museum again 15,000km from home.
Pic 4 - Bali, Indonesia. Example of low light ability. 5,000km from home
The OP was asking "in the interests of saving weight on a 4 month trip" and "this trip will be China - Mongolia - Russia - Iceland... UK, SA". I was pointing out that you can document your travels with extremely high IQ, easily with the A7R2 + 35mm F2.8 while carrying FAR less weight than with almost any other setup.
And if you want some "Travel Photography" see a few of mine below (most are before I went Sony). Or are these still just "basic family snapshots" to you?
Rome, Italy
Lijiang, China
Ubud, Indonesia
Tegalalang, Bali
Samburu, Kenya
Tanna, Vanuatu
Wales, UK
Boracay, Philippines.
Byron Bay, Australia.
London, UK
Paris, France
Serengetti, Tanzania
Masai Mara, Kenya
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Byron Bay, NSW, Australia
http://gallery.me.com/dp1975