Quick aside to tell that this comparison video was generated a long time ago, when stabilized video were saved at a lower resolution. Since then, we've increased the output resolution and fixed some color correction issues.

That'll explain it! Thanks.

Could that just be noticeable because they're side by side though?

You're right that it might not be noticeable if they're not side by side. But it's still fuzzier. Maybe it makes a difference for your application and maybe not.