They is 2 variants of Note 3.
Probably the one showing is Exynos 5 Octa 5420 which not support 4K video in hardware.
I don't think Note 3 will run like that, if it is, how it gonna to do 4K record.
Anyway, I will know by tomorrow as I am getting it tomorrow.
All 4K video I play before at XZU still with me, I can test it out on the spot.
Phone: Samsung Galaxy Note 3 | ROM: v4.3
Future Phone: Moto G (backup phone)
Ex. Phone: Nokia 3310, Samsung S500, Nokia 7610, Nokia 7270, Nokia 7280, SE K750, Nokia N73, LG Viewty KU990, Samsung Pixon, Samsung UltraTOUCH, Samsung OMNIA II, Nokia 3120 Classic, Google Nexus One, Samsung Galaxy S II, Samsung Galaxy S III, Sony Xperia Z, Sony Xperia Z Ultra
Tablet: Sony Xperia Tablet Z | ROM: v4.2.2
Future Tablet: Samsung Galaxy Note 10.1 - 2014 edition
Ex. Tablet: Google Nexus 10