If you have an HDR monitor, then 11 is worth upgrading to. AutoHDR makes things so easy; it just works. No need to even bother with calibrating anything; no need to worry about switching it off when going back to SDR content, either. All you gotta do is flip the "Use HDR" switch, set HDR tone mapping to "Auto" on your monitor, and then forget about it. That's it, couldn't be easier.
Meanwhile in 10, I have to turn off HDR every time I go back to SDR content, and in KDE, HDR doesn't even work properly yet on my LG C1. Neither issue exists in 11. HDR just works.