LOL - which man'f has the reliability/customer service edge again? I don't have enough insight to opine thoughtfully on this topic.
The comment about "niche" sounds like an interesting debate. If I am in the niche - it is a pretty big niche....
* Don't charge anybody money for my photo output/activity.
* Virtually 100% image viewing on a screen vs. print - (that is the biggy as it is limited to 10 bit depth best case)
* Modest cropping for composition
* Poor photoshop skills, perhaps a bit of shadow/highlight push/pull
* When in doubt bracket the exposure
* Enough disposable income that a net 2-3k total cost for a system change is comprehensible (stings, but isn't fatal to the marriage)
* Would take my gear more often if it was smaller. (I do not buy the cramps my fingers comments as this means you are holding your camera vs. lens when exposing the shot and the right hand should have a very light touch - good thing I am equally dysfunctional with both hands)
* shoot 99.9% of the time in adequate light (I know every shot has shadows and highlights - back in the day, I used 11 zone construct for my B&W)
No doubt I like the feel, sound and feedback of the 5DIII on silent shutter mode (5Ds series even better), something very satisfying and visceral.
Really like my glass config. I could see 50% of it staying in my bag w/ an adapter. But having an option to have a really small "walking around" package that has top of the line feature set..... hmmmm..... Look at the relative size of a MF 24-70 equiv to that of a APS/FF. One fits into a purse/backpack without much fuss, the other.....
Regardless, looking forward to your wife's conference. If we can get onto the Orlando Wetlands Park that would be nifty (Circle B equiv but WAY bigger).
Happy clicks.
Mike
Post script. Having read my post - sort of begs the question what are you waiting for? Get a MF body, a 12-35 f2.8, an adapter and sell off the 50% of the glass that is redundant, etc. Hmmmmm.... thinking, thinking, thinking.
Great days to all
Mike