With Thursday’s unveiling of the new 27-inch iMac with Retina 5K Display, Apple now offers “Retina” quality displays in all product categories: phone, tablet, laptop, and desktop. While the benefit of a Retina display varies greatly depending on the overall size of the panel and distance from the average user’s eyes during use, we were curious about how the new Retina iMac’s display compared to other Retina displays in terms of pixel density.