I have an X-T1 and Fuji glass. Also and X-Pro1.
I have the X-Pro2 on order, but I'm wondering what if I cancelled that order and bought a Sony. Any body have both Fuji and Sony a7 type cameras?
Opinions?
I have an xt1 and an a7r2. My Fuji lens lineup is basically full while the only native lens I have for the Sony is the 28/2. Lens selection and quality of FE stuff especially when considering the price

erformance/QC ratio is just poor. So for the time being, I just have the one FE lens since it is pretty good at a reasonable price. Had the FE 35/1.4 for a while and it was great at one thing and poor at everything else since the optics were not up to par (especially for $1600). The lenses I use 90% of the time with the Sony are all in Canon EF mount and adapted.
Fuji glass in general is great when considering there is no other ASPC line out there that is as complete with great options. Cost is reasonable unless you are preordering a new lens and paying the premium right away. Performance of all the faster primes is stellar.
I too have the xpro2 on preorder. But since we don't have it in our hands yet, it is impossible to know how good it will be.
Since you already own a Fuji rig, I won't go over with you all the reasons I love mine. I figure talking about more reasons why you might consider the Sony would be more useful.
Couple questions though. Which A7 body are you considering? And what lenses would you be using? Also, what do you shoot primarily?
Some points if you're considering the A7R2:
-Focusing is the best I've experienced with a mirrorless body to date. Significantly better than the xt1
-The raw files are the best I've had to date with regard to flexibility in post
-I am able to shoot all the way through the extended ISOs and still get very usable shots as there is so much resolution and data in the files that you will still be able to get very good looking prints or normal viewing size JPEGs from the raw files at the highest ISOs
-IBIS is the real deal
-Viewfinder is the best I've used yet. Manual focus is much better than on the xt1 even with the PIP of the xt1
-There is still lag in operation. Image review is slow, zooming in is slow, and general function just isn't swift. UI is still not great and shooting experience just isn't anywhere near as enjoyable as with the xt1
-Focus point selection still requires an extra click and there is no direct selection yet (perhaps coming in a future firmware update)
-Native lens line is overpriced (relative to other brands) and most are nothing to write home about (don't listen to the fanboys). QC is also an issue. Lots of good options if you're willing to adapt though. Consider that for the price of my entire Fuji kit which includes the 16, 23, 35/1.4, 56, 90, 18-55, 50-230 + Body, I paid just a shade less for only the Sony + 35/1.4.
-Full frame glass will always be the size of full frame glass. So if you're wanting to shoot with fast primes, they will always be large
-Electronic shutter only goes up to 1/8000th. I utilize the xt1 at faster speeds than that regularly
I'm sure there are some other things I'm forgetting to mention. But those are most of the main things I personally would consider when looking at making the switch in purchase from xpro to A7x.