The Sony A7 & r are going to be great cameras for what Sony has designed them to do. Having said that, one who is serious about his photography wants a system that will be supported into the future.
Leica is the only company, for example, that has maintained the same lens mount for 60 years. (M Mount) Last I checked they haven't hinted that is going to change. However, the R Leica owners got left out when that line was discontinued. I guess Leica could have turned the R into a manual digital camera too but at the time Leica was not doing well financially.
Earlier this year you had Sony experimenting with the RX1. That's my opinion. To me the RX1 is an experiment or say public prototype to see how well the masses would take to it. It has been very successful and they've sold a lot of them.
I sure would not want to be an RX1 owner now if I were going to try and sell it on the open market to fund the 7 or 7r for more flexibility. Both the new cameras sell for way less that the RX1 does right now. Talk about pulling the rug out from under you.
Then to all the NEX owners. Sony has said that line is dead, capice, done.
So when YYV_146 says this:
By comparison, I can buy a $2,200 A7r today and fire sell it for $1,200 in five years (approximating from the A900).
I think I'd like to make a counter bet.
If in 5 years the Sony A7r is selling for at half of its price now or more I will buy the camera from you. If not, you pay me $1,200.
I don't think the A7 or whatever Sony might call it will be around in 5 years.
But the real reason I wouldn't buy the Sony A7, Fuji, Olympus cameras is the lack of direct access to the 3 primary light controls: aperture, shutter and ISO. Plus none of the lenses in these modern cameras give you depth of focus guides. I don't even see a button on the back that would give me direct access to ISO. (Ok so someone is going to say its got such great ISO I just set it to Auto ISO to 12800, right) Sure I can whip out my smart phone and it up in some app or have it memorized. But if you're just a point and shoot photographer you need not worry about this.
I see the Sony A7 has the dials on the front and rear. I'm sure these are used to control the aperture and shutter if you're not using the "P" mode, which most will probably select anyway.
So can someone tell me if those dials "click" in a detent when adjusted to help prevent from accidentally moving them when holding the camera? If so the decisive moment is gone if while looking through the EVF have to concentrate on the aperture setting or shutter speed vice what's going on in front of the camera.
I don't know how many times using a camera like this with similar controls those dials get turned and you have a few shots that you can't retake.
These are just my opinions. The camera is just a tool but these differences in how they operate is a really big deal to me having come from a camera like the above to shooting with a Leica. If you need auto focus, the Leica is not for you. If spending $7000 would make you feel guilty that you're just buying to show off, then the Leica is not for you.