What I think is gonna be more important is your actual monitors. I've got 2 17" running 1280x1024 and X1 is significantly more real-estate hungry than 8.5.3.
What's a little bit of a downer (and perhaps some marketing-speak) is that there's no other software I use (Live, Vegas, Reaper, Sound Forge, etc) that is forcing me towards an upgrade path for my displays yet. If you factor in the "need" to upgrade displays, GPUs, and X1 itself we're talking a ton of dough. Granted that benefit gets to be shared by all other programs, but I wouldn't otherwise have been entertaining that upgrade right now.