A single 4K monitor is better than all the ones you lot have. Even 4x FHD screens, while technically offering the same desktop real estate, is not as a good as a single 4K monitor. It is just untidier and draws more power.
As for the priviledge of working on one, if it was up to my company, I would still be stuck in 2012 on 2x FHD screens. Yet in 2020 I bit the bullet and got my first 4K screen. It was a tad small at 27" so earlier this year I got a 32" Dell and it is perfect.
Edit - before any of you tries to justify "this monitor is for...." :
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