I had about 10 minutes play with one yesterday at a camera store.(the sale guy was quite understanding actually and they weren't busy, so... )
In a word .. NO!
I wouldn't trade a 5D Mk<anything>, nor a D800E, nor Pentax K3 or D300, D7100 .. etc.
Maybe the D70s .. but not any other proper camera for one of these.
Vf on the D70s is quite ordinary once you've got used to D300's K3's and upper level Canons.
EVF in my opinion is pretty much still sub par.
While it gives the illusion that it's bright, or whatever, the reality is that it's only a slight improvement in actual viewing pleasure compared to even my 10 yo digital video camera!
The problem is of course that video feed rendering .. more like looking at a TV closeup rather than actually seeing the rendered scene.
(of course this is only an opinion!!)
While there are some advantages to having an EVF, like zooming for focus, the benefits still don't outweight the artificial view that the eye actually sees.
I guess my preference is still for a slightly less bright, less 'zoomed in' view of a real projection, rather than the bright artificial view offered by these upper end EVFs.
Camera itself is surprisingly comfortable to hold, which surprised me a lot.
I was expecting a slippery dinky holding experience, but the grip is perfectly sculpted to suit my hand at least.
The only point of contention was where to place my pinky finger, as there is only room for the two central fingers on the comfy and grippy surfaced grip.
To be honest, I didn't feel that the weight saving of the camera over a lighter DSLR was enough of an advantage to go through all trouble of getting adapters.
The weight difference between A7 and D800 is significant tho, and even the D300 now feels 'heavy' by comparison, but of there is any difference in weight between an A7 and a small DSLR(I'm comparing the D70s) such as a D5300, Canon 700D DSLR, I doubt very much most people would notice it much nor complain.
To that end, I can see some comments made in justifying an A7 over a D800/5D sized camera in terms of saving weight .. but not over a D600/6D sized camera.
Size .. yeah. It is smaller. But the lens takes up more volume anyhow. A D600 with 50/1.8 feels about as neutral in terms of weight distribution as does the A7+55/1.8.
The 55/1.8 actually felt like a large heavy lens when compared to a Nikon 50/1.8(and I suspect a Canon 50/1.8. I don't know the exact specs and differences between those lenses, but the Zeiss felt bigger and heavier!
(I'm sure someone will chime in with actual specs too tho).
When this camera was revealed, I too was mildly interested in one, not so much for the portability of it, as I doubt I would have invested much money in FE lenses .. more so for the ability to attach all manner of lenses(via adapters), and maintain a wider image aspect.
One thing to note about these Alpha 7 series. If you buy in Aus, you get a metabone adapter of your choice too, to play with .. so while the retail price sounds initially high in Aus, take into account a ~$400 price for the adapter too!
I don't know how fussy you are about the aerial view you like to see through the vf Dylan, but if you are picky, I'm fairly confident you may not like it .. even tho it's apparently one of the best available!
I'm fairly picky and pedantic about my vf image, and have spent considerable money just to get a good balance of brightness, magnification and focus separation in my vf's ..
So take my comments about EVF's being subpar, with that level of pedantism in mind.
FWIW: I've seen Olympus Em-somethings(EM1 maybe) .. I just can't remember them all, and even tho may talk of how much better they are than OVFs .. maybe our eyes see differently.
And of note too, my intro into photography came more from a keener interest in video .. (at school, and later as a hobby), they all have EVFs which I used to hate back then too.