I run two 27" monitors 25601440 at 100%
Looks great and sharp, same size as 19" 19201080 at 100%
Key is don’t scale, get a bigger screen if your eyes can not keep up.
Neither OSX or Windows are fully HiDPI, and it will take years before app developers will feel the need to invest time and money to do the work necessary.
Cubase is of to a good start, but there still is a long way to go.