Not yet.
4K Is not super important to me, however my partner really wants one, so we will be getting one before the end of this year.
I want 3-D my partner want's 4K. So we are currently looking at a Samsung 65-Inch 4K 120hz Ultra SUHD Smart 3D LED HDTV.
I have always loved 3D for the 3D effect that it gives you (especially during horror movies.) My partner loves 4K for the clarity it provides you, so at least with this TV we each get what we want!
(Hope this helps a little)