Are you sure that is the correct type? since I can't find that even said UN75TV641Dxz exists.
UN75 yes, but only in UN75NU8000 and NU71000 types There is also UN75MU6300Fxza and F6400AF
Most of them don't of course mention at all what type of HDMI connection they have, Most of their spec sheets make no note of it either except digging deeper UN75MU8000 seems to support default of 2160P@60hz, which means it's hdmi 2.0
If the port would support 2.2, which is new and shiny and sounds cool on paper.. I'm pretty sure they would have mentioned it in their specs, that said, I'm quite certain they wont support 2.2 but some might support 2.0 (and I have no idea about your mentioned TV since according to google, it doesn't exist, so.. I guess HDMI 1.4?)
I could be wrong, but a link to actual TV might help look further.