Ok so I'm pretty torn at the moment between these two cameras. I'm going to be buying one of them this week and I keep going back and forward between the two.
They're both amazing cameras and both very similar in specs and performance. The main difference with the A7R version is the 42mp sensor vs the 24mp on the A7. It also costs about 650 euro more (at least based on current prices).
I've got quite a few samples from both cameras in Capture One and am blown away by what both cameras can do. The resolution on the A7R is just insane but then again I very rarely get large prints done so the resolution may not actually be of any benefit. I don't often crop images either but I do like having the option. The A7 III seems to perform even better in lower light so images up to ISO 8000 are very clean and usable. Also the video performance of the A7 III in low light conditions is just insane. Its pretty much beats everything else out there at the moment at high ISO.
What do you guys think? Would the extra megapixels of the A7R III make much difference to you? Any other factors that would make you pick one over the other?