Need it in 4K? Probably not. For $5 more you should want it in 4K.
Thankfully I realized that I had already purchased F&F7 (thank you DVD Profiler!). I was thrown off until I realized it was alphabetically disconnected from the first six film (filed under F-U rather than F-A). And I got the first six films in one of the collection sets that seem to be issued every time a new film is released.
So now that I only need to pick up TFofF, I might actually pick up the 4k from Amazon...or wait for it to go on some kind of great sale.