The Huawei screen was very good and was excellent value for money although it must have been quietly discontinued because it's impossible to find now. In the end I sold it because, as good as it was, it wasn't as good as my MacBook display and I got a good price for it.
I did pick up a Dell 4k 27 inch towards the end of last year but only because it was £179 direct from Dell and it's handy to have for those times when I need a larger or more ergonomic monitor. I still use the MacBook/iPad 95% of the time.
As for 4k in general, it's a big step up from 1440p (in terms of how iOS handles it), I'll never go lower than 4k in that regard. I find 4k scales perfectly well and it looks tack sharp to my eyes - YMMV.