How have you found the performance of 4k display, do things scale well? - Not sure what type of workflow you undertake, how is it in terms of colour reproduction?
In summary, I'm still very happy with it.
The scaling option I use (2560x1707 apparently) is just perfect for my own needs. A few years ago I may well have just run it at native res but alas I favour comfort these days.
Despite MacOS itself saying that non-native resolutions
may impact performance I have encountered no such issues in day-to-day use. I tested it against both the native resolutions and noticed no difference.
However, where I HAVE noticed it is in Capture One and when I am working on an image in full screen. I have noticed some lag the doing pixel intensive tasks such as adjusting clarity etc. It's a very isolated issue and one that is easily rectified by either changing the scaling or just simply resizing the window that I am working on for that particular task.
For my 9-5 I primarily read PDF documents and use Excel/Access. For those purposes I find the aspect ratio much more pleasing than 16:9, and particularly 21:9, where I find the extra height more useful than the extra width on the latter.
For my freelance/hobby photography workflow, again the aspect ratio is absolutely spot on - the 4:3 nature of RAW photos works perfectly with the monitor.
As for colour reproduction, I may not be the best person to offer quantitative advice. All I can say I find the colours superb for my needs and what has impressed me are the black levels - considering it's an IPS panel.
I use the monitor in HDR mode (I know it's not true HDR) but it adds a lovely pop and contrast to all round usage.
So far it's the closest display I've used, in terms of quality, to the MacBook screen itself. Of course, if I had the money I would splurge on one of the Apple displays, but for the price this Huawei is a solid purchase IMO.