How typical might you be of a7x users, Dan, being so complacent about these 750 gram lenses turning your a7x model into a water divining tool? This was always a threat to the need for right sized lenses for a7x users - multi-system users.
Hard to know how tolerant regular single system a7x users are, but the field is certainly open for fans of giant, built to the
upper limit of endurance lenses. That Canon 35L actually dwarfs the 5DSr body, it is hard to believe something so ugly and misbegotten can be perpetuated on the buying public in 2016.
Here it is:
http://www.photozone.de/canon_eos_ff/964-canon35f14mk2
In fact, it is getting hard to buy anything else, if you look at Sigma, Tamron, Zeiss DSLR, Sony themselves, Canon. Big lenses are brute force and ignorance efforts, maybe the message will take a year or two more to sink in.
Any moves to downsize DSLR bodies to meet public demand is swiftly being negated by these gigantor lenses.
The first other company besides Zeiss to realize more is needed in the way of elegant, well-proportioned and discreet optics will reap what they sow, with a7x enthusiasts at least. The other guys can hire donkeys. Or carry a backpack. lol.