Not sure why so many people are so unhappy with Sony... Their 55mm lens is STUNNING, I really like my A7R so far, but it will not replace my Canon kit.
I think you answered your own question . . . it won't replace your Canons.
I don't think people are necessarily unhappy with Sony as disappointed.
The A7 series could have been ground breaking, off the scale when you think about ti.
A smaller form factor system that one body shoots 35 mpx stills the other 4k video.
It's just like all Sony's there is a "what if".
What if the A7s shot internal 4k for smaller stabilizers and drones, what if you could crop into the frame and us PL mount lenses, what if it was at least 10 bit and not 8 bit which is really from 1994 not 2014.
What if the xlr input module was mounted on the bottom for security and form factor not hanging off the side, what if it had stabilization, what if the lcd screen flipped out and had touch screen focus, what if the focus points covered the whole sensor what if it shot a higher bit rate than 50 mbs . . . well you get the idea.
The A7 has now kind of lost it's place as it's not head over heels better for stills than the a7s, probably not as good at video.the A7R seems like it produces a stunning still, but it has the same smaller focus coverage.
Though I haven't tried the a7s, I tested, tested and tested a gh3 and olympus em1, em5 next to the A7 and the image quality wasn't any difference, actually I believe the smaller sensor em1 did better stills, I know the gh3 better video.
I think the A7 series is just typical Sony. It has all the basics covered but whether by choice, price point, protecting higher priced models, or just rushed to market, it's an almost there camera system because an A7r and a A7s could replace three camera brands and three cases we carry for projects.
I think it's a great system, that will get better if Sony sticks with it and doesn't offer excuses. They have the tech, they have the ability to build a smaller form factor camera that is quick to set up and shoot.
I will test it, hope the 420 8 bit shoots above it's weight class, hope alaising is down and no jagged stuff on horizontal lines like the A7, but I'd pay double if Sony would take the gloves off and build what the market is really asking for.
We're getting into smaller form factor cameras, that are easier to use. It's not that we can't cover everything with traditional digital video 4k's that exist but they do require more light, heavier supports which essentially means lower cost production.