I don't have to worry about trying this one......it's way out of my budget even before the lenses! I've tried the A7 series a few times but just don't enjoy them much. I also don't see much size savings once you as these crazy expensive Zeiss lenses.
If I had $6000 to burn, I would probably buy a Leica. Maybe that way it might hold some value.
1 --- You will have it within 6 months.
2 --- It is VERY expensive. You can debate what the threshold price is for "enthusiasts" but I certainly would say it's somewhere less than $3,000. I know it's priced a bit less than the Canon 5ds, but we will see whether that's really for enthusiasts, or just for pros. Are they just trying to sell this camera in the Nikon D4s and Canon 1dx market, or do they intend for this to be a broad consumer product? Therefore, I strongly suspect...
3-- We will see the price drop to under $3,000 by Christmas. Still expensive... but it could go as low as $2500-$2800, which puts it at a less absurd level. Still expensive, but competitive with other full frame dSLRs.
4 --- Size savings. I play devil's advocate to both sides on this one. The weight savings are not hugely significant, especially if you use premium glass. But when using certain primes and some of their more compact lenses, you can certainly have a less bulky kit. No, it will never be as small as your Fujis, etc.. but it is full frame.
5 --- Sony lenses are expensive, over-priced. And there are continued weaknesses in the FE lineup. BUT, if the talk is accurate, this is practically a universal mount. Without any true penalties, you may be able to use any SAM/SSM A-mount lens, and any full frame Canon lens. That REALLY opens the doors.
6 --- Technology typically migrates down to the lower end cameras. Personally, I neither want nor need 42mp. Even if 2 cameras were otherwise identical and the same price except for resolution, I'd probably take the 24mp over the 42. Ever since the D800 and A7r first came out, you hear some folks regret the higher MP cameras. Tom Bricker switched from the D810 to the D750 as his primary camera, mostly because he realized the files were simply too big. Sony blogger Kurt Munger regretted his purchase of the A7r, noting he should have just gone with the smaller files of the A7. With now the A7rii and the Canon 5Ds coming out, I think we will see more of a realization that maybe the ultra high resolution isn't much of a benefit. There will be a market for it, but I can also see a demand for lower resolution cameras......
So how about in 6 months to 1 years: The A7p (for performance): The same autofocus system as the A7r. Maybe skip the 4k. Same advanced sensor technology, but only 20-24mp. With the lower resolution, increase the burst rate to 6-8 fps. Priced at $1999-$2299. If they offered that camera, it would seriously tempt me to switch back to Sony.
I'm not currently tempted because: I don't want or need 42mp..... and I'm not about to spend $3200 on a camera body.
This is still a VERY exciting camera, as it should put pressure on Canon and Nikon, and because it signals where the technology is heading, with likely cheaper models incorporating much of the technology.