The Asus PG279Q is not even near the league of the Dell UP3214Q to begin with .... 27" vs 32", 1440p vs 2160p, IPS panel vs Sharp IGZO panel (no more .... zzzz) and just that the ASUS PG279Q is GSync 165Hz
If want GSync and bigger in size - Look @ ASUS PG348Q 34" 1440p 100Hz curved monitor.
If want retain same size, from 4k to 5k and comes with display port 1.3, check out this year ASUS ProArt 32" 5K monitor.
Or if you want even better in size, check out the new Dell 43" 4k monitor ... but @ this age still no HDMI 2.0 .... and no display port 1.3 either
Dell SG website has removed it ... it's was retailing for quite a while @ SGD$1699 if i remember it correctly and only Dell US still have it on their listing with almost a month delivery lead time ....
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=fed&cs=16&sku=210-ahsq