The A7 is a headline camera. not a mature system.
Jaw dropping specs for the price, well targeted models for specific target models, of course Canon should have made something like it, full frame - doh! a 4k variant - doh! a high resolution version - doh! a low light king with 400k+ plus iso? doh! canon. doh! doh! doh!
I'm selling all my eos gear and buying one tomorrow, just lie I did when the d90 came out with video, even though I had to buy it all anew when the 5d2 came out, only to sell it again when d800 came out,only to buyit all again when the d800 kept breaking, of course with a detour by the fuji x system on the way, would have kept that but for the orbs...
dang.
If only canon had the freedom to design a camera from scratch, unrestrained by the 75+ range of EF lenses.
So we have the a7. The camera the eos m should have been. oh but without an optical viewfinder (not really getting into the spirit of this mirrorless idea are we?)
Yes folks, I am talking bullocks.
As a video guy I half think, yeah an a7s.... 4k! super!
I need 4k about as much as I need more than 6mp, but thats not the point, when did need come into buying new camera gear.
So I am actually stuck with the boring aka 'mature' EOS system. when what I actually want is to buy a complete new range of newly developed lenses in a newly developed system, that wont work with my flashguns, that wont work with my memory cards, that won't even work with my couple of year old video editing app or generation old photoshop...
And dang that a7, if I want all of its headline features I'm actually going to have to buy and carry 3 cameras.
But the worst mistake of all would be to make my decision based on what wedding ohotographers are doing.
For me 95% of wedding photographers are chancers. A bold statement, and one that will see me accused of trolling / flaming / whatever else. if you are offended by this, i didn't mean YOU, you dear reader are clearly in the 5%, so please, save us both the correspondence...
The upshot is, I'm not going to buy an a7. Sony will ditch the mount come the a8. Sony have the sensor advantage for now, and Nikon are riding on the back of that. nobody else has the canon glass, and in that regard, along with af tech, everybody else has been playing catch up with the ef ststem for most of its life.
so if you need to fill a billboard or the side of a double decker then get an a7r.
if you need a camera that sits at the eye and can change af modes, wb modes, track at 8-10fps, in the rain then get a canon.