Apple iMac 21.5-inch Retina 4K (Late 2015)

88% of the reviews on Amazon.com give this product a positive rating.

4K resolution is now an option ; Improved color accuracy ; Attractive design ; Input devices are now rechargeable ; Robust audio

Faster Fusion Drives are an up-sell, even on more expensive models ; Slow start-up with the entry-level 5,400 rpm hard drive ; Discrete graphics no longeroffered on the 21.5-inch iMac

The iMac is still the best all-in-one, with an attractive (if predictable) design, near-standard 4K and 5K screens, and even better color accuracy than before. The 21.5-inch version is in some ways the more interesting of the two models, as this is the...

Bright 4K Retina display. DCI-P3 color gamut. New rechargeable wireless peripherals. Includes Lightning cable.

No discrete graphics option. Base hard drive is only 5,400rpm. Headset jack and SD card slot are on back panel.

Conclusion If you make your living through the lens of a camera, or you're a serious creative type, the 21.5-inch 4K Retina iMac belongs high up on your short list —especially if you want the hi-res display but don't want to pay for the 27-inch 5K iMac...

Superb color rendering with DCI-P3 color space ; Fast, powerful machine for most uses ; Beautiful design ; Wonderfully quiet, cool running ; Decent price tag ; 9.4 million pixels ; El Capitan OS X works great with 4K display

No HDMI connectivity ; Uses slightly older Intel processing chip architecture ; No discrete Graphics card technology ; Storage memory could have been more advanced

While we consider Apple’s 5K Retina iMac to be the superior machine overall, the new 4k iMac has plenty going for it and comes at a relatively reasonable price for a piece of Apple technology with such a superb integrated True 4K display. On the whole,...

Bright, colourful 4K display ; Broadwell update provides strong processor performance ; Slimline, all-in-one design

Slow hard drive ; No longer includes discrete GPU ; Limited upgrade options

Gorgeous Retina screen ; Thunderbolt 2 support

Fast flash-storage available as an option ; Hampered by slow 5200 rpm hard drive ; Discrete GPU available only as configuration option ; Uses previous generation Intel chipset

The 5K iMac is an incredible computer, one of the best Macs ever made—but it’s also just too much for many people. A 27-inch display can dominate a desk or a room, and though the price tag has come down a lot in the past year, it’s still on the pricey...

Gorgeous screen with an improved color gamut ; Retina scaling modes let you use the 21.5-inch iMac to display as much information as the 27-inch iMac, a nice feature for people without much space ; Quad-core Broadwell CPUs aren't the newest on the...

No dedicated GPU options, and the integrated GPU chugs if you increase the resolution or hook up another 4K display ; No user-accessible RAM (or any user-accessible parts, really) ; No Thunderbolt 3 or USB Type-C ; No Target Display Mode ; Putting all...

The best thing about the 4K iMac is that you don't have to use a gigantic 27-inch model if you want to get a Retina display. There are plenty of people who prefer the larger screen, but for those who find it intimidating or just too big for their...