For the daytime shots especially, I see lots of weird aliasing artifacts on the buildings. Is it like that for everyone, or is that just a sideeffect of watching a 4320p video on a 1440p monitor?
It’s aliasing. You don’t see it on stuff filmed with most consumer cameras because they have an anti aliasing filter over the sensor. If you want maximum resolution, you remove that filter. They could have removed it in post but again it would reduce the effective resolution.
That's incorrect. You're thinking of a low pass filter, for which the Red supports a variety of filters that you can switch. What the parent most likely is seeing is bad nearest-neighbor downscaling (e.g bad selection of downscaling algorithm).
Maybe photo vs film terminology? On my canon 5DSr, it is definitely the physical antialiasing filter that is removed to allow improved sharpness per pixel at the expense of greater risk of moire.
It is an artifact of the down sampling being used, yes. It wouldn't be the same if you were watching the 8k source directly, but few people are probably able to do that.
I have a high definition monitor and TVs. It looks gorgeous on them.