Anyone running a 4k kodi box?

Just got a 4k tv and love the 4k netflix.  I have a kodi box that is hit or miss with HD but I was wondering if i should upgrade to something like an nvidia shield or Amazon fire 4k?  I can't see it being smooth for some reason.  I have a sufficient internet plan and I am running Ethernet directly Into the tv from my router on a 100Mb plan.

Not that much 4K content .  Phoenix and some dude named morepower got a few 4K movies but not much.

 

id still get the 4K firetv cuz it's awesome but 4K is still a very early technology 

That's what I figured