Hardware.Info checked out the 'Retina' by Iiyama: Iiyama ProLite XB2779QQS 5K Monitor
A quote from the article:
A 5K monitor for 750 pounds / 800 euros? Iiyama has recently added one to its product range. Internally, the ProLite XB2779QQS features the same panel as the 27 inch Apple iMac with Retina screen. The 5120 x 2880 pixel counting screen offers a very sharp display with 218 ppi. The exterior design is also a bit like an Apple monitor. Is the XB2779QS too good to be true, or a good deal?'Retina' by Iiyama: Iiyama ProLite XB2779QQS 5K Monitor Review
Monitor manufacturer Iiyama is mainly known for business models with a focus on a good price-quality ratio. That's why we were surprised when the XB2779QQS appeared in our Price Comparison. With its very high 5K resolution, it's one of the most advanced models in Iiyama's line-up, and at 750 pounds / 800 euros it's also the most expensive monitor in the range. At the same time it is typical of Iiyama to launch such a monitor: in absolute terms the monitor is not cheap, but for a screen with such specifications you paid twice as much not so long ago.