A lot was made of the new sky but honestly, if if wasn’t mentioned I wouldn’t have thought about it tbh am I missing something, do I need a visit to the optician?
Really the one improvement over TSW2020 is that TSW2 now has high-altitude cirrus clouds, these are those really curved, whispy looking clouds you see high up in the sky (you often see these irl arriving ahead of cold fronts, rain clouds...that sort of thing) I guess you can say it's a bit more realistic, plus it just looks nice compared to how clouds look in TSW2020
I can't tell much difference and if I'm being honest it makes zero difference to me, I'm usually more concerned in driving the train.
Clouds look a bit more "fluffier" and it doesn't look as flat as the last one. I don't really know...but it does look better.