This is an interesting and curious observation. Are both machines driving the MateView at the native 3840×2560 60 Hz mode (double-click on a scaled mode in SwitchResX and check the timing)?
As I understand yes, they are! Pls check the screenshot (anyway SwitchResX gives the same info on both Macs)
So I took an M1 MBA from my wife's sis for a test and did some further investigation. Here's interesting and kinda unexpected things which I've came up to:
1) There is absolutely zero difference in hdpi and non-hipdi scaling results & picture quality on MateView (and I believe on any other 4k monitor of around 27"-28") between M1 and M1 Pro (and Max obviously) in general and in terms of sharpness/blurriness in particular — they are literally the same! Thats good news for me cause now I know for sure that there is no problem with my new MBP, it's just some Apple Silicon issue. The only difference is that the M1 can't scale to more than 3008 pixels in width which we already know.
2) At the moment Apple Silicon Macs graphics drivers and scaling algorhythms are bit more demanding than Intel Mac ones in terms of scaling and resolutions — in the ideal case you should use integer hipdi (aka true retina) 2x scaling. Non-integer hidpi scaling is not bad though,
but it has some peculiarity which almost equally effects the built-in and external screens (more on that pls read below)
3) The peculiarity is that in case of non-integer hidpi scaling the Apple Silicon macs provide a slightly more blurry picture when it is about
white letters on black (and actually any dark) backgrounds! The white letters gain a barely noticeable shadow or black inking (you name it) which is perceived as that blur, but t
here is no visible difference (no shadows) in more common case of black (or grey) letters on white backgrounds! That's very surprising. I just always use dark themes everywhere in macOS that's why I noticed it. As I've already said this effects both the MateVew and the internal screens of Macbooks (I checked it attentively) but it is just more noticeable on MateView — this is no surprise because it's PPI is lower than on Macs.
For those of you who are interested I've made some pics (
click to download .zip) of MateView's screen with intel vs with m1 pro to try to show these things. The pics are not very informative but they are the most I could get from 13 pro max camera with 2x zoom (pics of telegram settings) and with macro (pics of monitor resolution settings). Pls consider that some blur is caused by the shaking of iphone in my hand.
PS I ended up setting the 3008x2005 non-integer hidpi resolution for MateView for
black theme with white font — the fonts are sharp and look better than on 3360x2240 and there is still good amount of space.
PPS does it look like an issue we should report of to Apple or at least create a separate thread here or on reddit?