Upload & Sell: Off
Weather sealing is such a nebulous claim, and few actually test it out properly, so I never know what to think of it. One of the best indicators of sealing I've seen is that old Dakar Rally article about the A900, which did really well, despite having unsealed lenses.
Like I said, I don't think I'd trust the A7r in bad weather any more or less than my taped up RX1. It's all a bit of a risk.
The think I don't love about the RX1 is that, like a point and shoot, if you drop the camera on the lens, there is the possibility that it freezes the whole camera, rather than allowing you to just switch out the damaged lens. That's the main thing I worry about.