There’s a lot to consider about Apple’s new iMac with Retina 5K Display. Marco Arment has a comparison of the new iMac vs. the Mac Pro (on paper) – here’s what he writes about 4K and 5K displays:

This difference is much bigger than it sounds. It’s the same, proportionally, as the difference between typical 21- to 24-inch and 27- to 30-inch monitors: “4K” computer monitors have 8.3 megapixels, while “5K” has 14.7 megapixels. Without software scaling to simulate higher density, the “right” size for a 4K monitor tops out at 24 inches, while a 5K monitor looks right at 27 to 30 inches.

It’s a huge difference.

Make sure to read the entire post as he makes some solid points with interesting technical observations.

Christina Bonnington also published a great FAQ on the new iMac at Wired, and I liked her explanation of why 5K is actually useful:

For most of us, a 5K display is just an extravagance, a high-end computing machine with specs that make our friends’ jaws drop. But for professionals in some industries, such a high pixel density is quite important.

For example, 5K resolution is great for those working on 4K content. “You can view all of the images at their true native 4K resolution, which is very important, and then have a fair amount of leftover screen space all around it for controls, icons, and even a generous 3.2-inch high text area at the bottom for commands and text input,” Displaymate’s Ray Soneira told WIRED. This actually ends up being better and more efficient than using a second monitor because you can keep your eyes on the images while working on them, instead of having to glance off to the side.

IHS Technology’s Rhoda Alexander points out that in addition to those in graphics-related fields like CAD and CG, healthcare imaging (like radiology) also has need for displays with a very high resolution.