Oh dear, a visit to Park Cameras and I'm about £2,700 worse off. Bugger. And they didn't have the Zeiss Batis 25mm F2 in stock, so it could have been an even worse hit on my reserves.
I seem to own a Sony A7Rii
Exploring how well my existing A mount lenses work with the adaptor is amusing, the ancient Sigma 70-300 is manual focus only (but with focus peaking, no big deal, and it was a slow old focuser anyway), the Sigma 150-500 is fine in autofocus, the Sigma APS-C 10-20 ultrawide is manual focus only (but hey, you hardly have to focus that thing) and the APS-C Sigma 17-70 is fine, just as if it was on its intended APS-C A mount camera.
42 Megapixel uncompressed RAW files are a bit big!
Just had to buy a 64Gb UHS ii SD card, or I won't be able to shoot 4K video (not that I presently have any need for it...)