Upload & Sell: Off
I got an A7 today, after my past experience with the A7r. Got it for a fantastic price, and honestly I prefer it to the A7r, regardless of the cost.
If I didn't know it in advance, I don't think I could tell the build apart, and likely would of never noticed some dials are plastic. Same goes for the front plate, got out of your way to feel it and you can notice a slight difference, but hardly one that matters.
What did feel rather drastic, bearing in mind I don't have the A7r to directly compare any more, is how much more responsive the shutter feels on the A7 with the EFC.
Compared to my RX1, the A7r was pretty darn sluggish (RX1 has next to zero lag mind you) but still workable for most of the shooting I did with it.
AF speed wise, w/ 35 FE, also does have a noticeable speed improvement. I personally never though the A7r was bad by any means, and if anything it was a very nice improvement over the RX1, but again sans direct comparison, the A7 feels pretty darn snappy from what I remember. In good light, felt pretty instant, easily on par with my Fuji X bodies and m4/3 cameras, though not as good as m4/3 in low light, where Panasonic really is stellar.
24 meg files look good and sharpen up nicely, though not quite as impressive for pixel peeping as the AA-less A7r 36 meg files. Still pretty darn good though and really 24 meg is plenty for me, especially given the savings over the R version.
Don't see much of a difference in high ISO though, which came as a little bit of a surprise. Still pretty darn good at high ISO, just like most cameras on the market.
The S version may prove to be better by a good margin in that area, but I honestly can't really see myself ever needing to shoot ISO 400,000
For some the A7r still is the better choice, but try out both if you can and be honest with yourself about your needs. 36 meg AA-less files sound great in theory, but can be a bit demanding of technique. I always needed quite the higher shutter speed to get sharp shots handheld as I'm not too steady and boy did the R make it apparent.
I know a lot of us only like MF glass, work from a tripod, just shoot landscapes and artsy stuff etc, and that is fine and good, but the A7 feels a bit like it can do that stuff too, but also has pretty good response and decent enough AF to cross over to handling more "general" purpose camera duties, as well as any other mirrorless option.