Linux

So from some of your comments, it seems that by sharpness, you are referring to the sharpness of text in gnome on high resolution displays (4k in your case) when compared to macos or windows. Well in my experience, text rendering in Linux hasn't been as good as the macos or windows but it has been improving steadily. If I remember correctly, the differences lie in the anti aliasing done to text to make them sharper. Somebody please correct me if I am wrong.

Also maybe edit your post to mention that the high quality you are talking about is the sharpness of font rendering.

Check elementary OS

As others have said, it is not entirely clear what you mean by sharp. Based on the rounded corner and button example you gave previously, I think it might just be the graphic design. MacOS has had a lot of time invested into its design language including subtle things like a thin, almost glass-like specular border around windows and then a drop shadow. This very much becomes a matter of taste in many cases, but for some it helps identify boundaries more precisely. Perhaps have a look at https://github.com/vinceliuice/WhiteSur-gtk-theme, which replicates MacOS as closely as possible. You may be able to experiment with it side by side and see if you can figure out exactly what design element it is that you are looking for.

Because it's not Plasma 6.

Because Linux doesnt compete with MacOS? Linux doesnt compete against any other OS because unlike Windows or MacOS, Linux isnt owned by a for-profit organization (Linux doesnt have something to sell). Gnome is driven by community efforts to polish a community maintained set of tools, I would say theyve done a very good job.

Gnome is just as beautiful as MacOS. The only difference is that MacOS is colorful, while Gnome is more b&w in its design. In fact, I'd say that gnome is more modern than macOS in its overall design philosophy. So modern, that some people hate it, lol. But modern nonetheless.

If you want the MacOS experience, install Garuda. Personally, I hate that global menu, and the first thing I do on a fresh install is get rid of it, but if that's what you like...

It's KDE, not GNOME, though.

Sharp as, it looks blurry or sharp as, its not polished?

I find Gnome smoother than macOS.

This wasn't the case many years ago, but now I find Gnome pretty good, the amount of bugs are surprisingly low.

On the other hand, I experience glitches on macOS regularly on the UI, especially on a multi-monitor setup (I use both Gnome and macOS with multiple monitors).

And generally feature-wise I find Gnome a lot more convenient to use in terms of window or workspace management.

KDE Plasma may be a lot more customizable than Gnome, so you might be able to find something more like what you are looking for there. I would do a web search for varied examples if I were you.

You could search for more Gnome examples too. I believe Gnome requires more in the way of plugins for customization, so you might have to seek out examples of gnome plugins that customize look and feel or window styling. I'm just speculating here, I don't really know Gnome very well.

It was definitely Unity on Ubuntu plus Cairo dock that pulled me out of the Mac life way back in the early 10s, so I'm still sad Unity is gone and Lumiri is basically abandoned from the start. But these days I really like Plasma, as someone who considers the Windows 11 UI to look rather clean (gasp!)

Look at the kde themes in the settings app.

Gnome emulates MacOS in the worst ways possible. See: all the whitespace in gtk apps.

Are you using fractional scaling?

You won't get the same united look in Gnome as in mac OS. Applications will look a bit different and not exactly the same.

I think you get used to it though. I don't think about it at all anymore.

Have you tried theming gnome? There's a ton of videos on youtube if you're a beginner, i wonder if you'll have the same thoughts after theming it