Here's how they look in KDE Neon User Edition. IMO they look nicer. What do you think?
We use Noto as the default font for all of our editions. This ensures visual consistency of fonts from one DE to the next. You are of course welcome to customize your own system to your heart's content.
The Solus one was shot with default font settings (as it was in testing v1 before updating).
EDIT: IT WAS NEVER AN ISSUE IN NEON AT NO POINT IN TIME. But now it looks okay in Solus so this chapter is closed.