I’ll have to agree with duellingcarl - The X is worth the extra cash (IMHO)! I have an S and an X.. and when the X is busy, I use the S… and the difference in GFX and gameplay is night and day. For those that tell you ‘The X doesn’t give you anything the S doesn’t have’ does not own, or play regularly, on an X!
My X is driving a 75" Samsung 4K HDR, and I can see EVERY SUBTLE DETAIL. The color and maps are very beautiful (Frostbite rocks!) and the gameplay is awesome! I bought mine a week before it was released, but I have heard (from the rumor mill) that the consoles are getting ready to have a $100 price drop. It just concluded it’s first price drop (in celebration of E3), and is fixing to have another… so we’ll see.
Either way, you won’t be disappointed. If you already have a good 4K set, then putting an X on it is a no brainer for me.
Good luck with your purchase. Hope to see you online (on your new X) soon!