For the sake of one game? Probably not, but you've already made your choice!
You wouldn't be able to tell any difference between the Pro and X version unless you analysed it like all those popular YouTube channels(the hype train, as well as some posts on this forum) that cost you a fortune until you realise they talk nonsense. £3k TV might notice a difference but not worth £400 and an HDMI slot and more clutter. PS4 has easily the best exclusives and therefore given what I've just said, this X will gather dust and you'll be ****** at wasting £400. Trust me, been there more than once.
As much as anything I simply fancy a new gadget!