Normally I stay out of these convo's as people tend to get childish and borderline rude, as well as I don't think people's opinions are going to change, right or wrong. But I wanted to correct a few things I noticed:
the shutter was noisy and vibrated significantly. put anything long than 100mm lens and the images blurred from this.
From what I read the issue is limited to a certain range of slower shutter speeds ( only around 1/50 or something?), but I haven't tested it since I mainly use 14-50mm on my A7r (landscapes). I just put my 70-200 F/4 on my A7r for the first time to test this and shot from my tripod at 200mm, F4, 1/320, iso100. Results were sharp (well, as sharp as can be expected when I can visibly see heat shimmer coming off the roof I focused on).
A simple example is I do use the EVF panel at 10 times magnification on the DSLR to get focus on landscapes. the A7R won't do this unless you use Sony branded lenses
I bought the A7R for landscapes too, and in my experience this is not true. Note that I mainly shoot landscape, so my typical setup is on a tripod, zoom in, manual focus, hit the shutter release, which is what you describe. Technically, you're right, it won't zoom in at 10x with Canon lenses; it zooms at 7.2x and 14.4x
I just tried it; you DO have to remember to flip the autofocus switch to manual if your lens has one.
And since I wondered if there were brand-specific issues, I also just grabbed my Rokinon 14mm, Sigma 35A & 50 1.4, and I could zoom in on all of them. Note that I have the Metabones adapter (VIII I think), so it could be possible there's some issue if you used a different brand or version adapter.
no remote shutter easily available so make your own etc etc.
Here in the US Sony's RM-VPR1 remote shutter release is readily available on Amazon, Adorama, B&H etc. I'm not sure about outside of the US. Granted, it's expensive and basic, similar to Canon's. A quick glance at Amazon.com shows me there's some cheaper third party ones too. There's also the built-in wireless option, but I'm sure that would reduce the already bad battery life.