Even though different Linux distros are often fairly close in terms of real-life performance and all of them have a clear advantage over Windows in many use cases, we can't reject the fact that Arch Linux has undoubtedly won the competition. And now I'm so glad to have another reason to proudly say "I use Arch btw"
7GB is a reasonable size for a Linux install with a GUI and some software. The rest are excessively large. I've never gone over 30GB of disk usage in my root partition, even with a large number of programs installed.