With all developers effort, the Kodi/XBMC experience on older E2 boxes is not very "exciting", I guess due slow processing power.

However, the newer 4K machines, for instance Uno 4K, with ARM dual core*Broadcom 7252s processors shall be able to run full Kodi at a fraction of the available power. Actually they are some of the most powerful boxes on the market at this time.

Unfortunately Kodi implementation on the 4K new boxes is the same as on the old boxes, it forces Kodi to use the E2 player which has very limited capability, not even subtitles, most plugins don't work, broken CIFS, no IPTV, no PVR plugins.
Generally speaking, if you never seen the real Kodi, the E2 kodi implementation is so basic that is nothing to look forward for.

Is it possible to have a standard Kodi implementation only on 4K boxes, something maybe not compiled in, just a ipk that users can update to the latest Kodi release and having all Kodi standard features?