Originally Posted by Ungermann
macOS cannot property scale unlike Windows, it basically enlarges pixels, so everything becomes more pixelated, what is the point of having a 4K monitor then? I have a 27-inch monitor at work and I use crappy Apple's scaling on it to make text a bit larger.
I actually find the Mac scales text better than Windows. I can’t compare video scaling since displaying 4K video on my 4K Windows screen requires no scaling at all. I’ve always found adhering to the monitor’s native resolution is better than upscaling, regardless of the monitor. Now if I had a 5K Windows monitor than I’d be able to compare video scaling to the 5K IMac.
To answer your question about why have a 5K Mac monitor if you lose sharpness while upscaling, it’s because you have a larger workspace in 5K. Most Mac users don’t
scale their 4K video, and this enables them to display the native 4K video while having the space for other work components on the screen at the same time. Most view that as a nice advantage. The other advantage is smaller, less visible pixels when sitting close to a 5K monitor.
In my case, since I prefer going full screen when viewing video, a 27” 4K IMac would still have been better for me. The only issue is they don’t make such an animal. You either get a 21” 4K IMac or a 27” 5K IMac. I wanted the bigger screen real estate and I prefer the MacOS & FCP for editing.