Hello! Apologies if this is not really the place for feature requests, I’m new to this and I got a little bit lost going between invent.kde.org and bugs.kde.org. 
Anyway, the issue:
The Updates tab on Discover makes it difficult to tell which of the updates are large in file-size and which are minor. When scrolling the list, the mix of different MiB/KiB units makes is hard to spot the larger ones at a glance, and there’s no ability to sort that list by size. For me this is mostly a curiosity thing, I want to know what’s making the updates multiple GiB in size. But I imagine people with more limited internet connections might want to skip large updates in software they care less about.
The mixed-units issue might be specific to Fedora, as I’ve noticed the same thing when running dnf directly. Being able to sort the list would be very nice though in my opinion.
I haven’t worked on KDE before and I don’t have a ton of free time, but I’d be happy to have a go at this myself if other people think it would be useful.