Same design, new insides, better screen: all iMacs are retina now

It's been over three years since the very first Mac went Retina, and we're still waiting for every model to get the upgrade. But this year, the scales started to tip in Retina's favor. We got an all-new Retina MacBook in the spring, and today Apple is killing the 27-inch non-Retina iMac and introducing a new 4K model at the top of the 21.5-inch lineup.The 4K iMac starts at $1,499 and does for the 21-inch iMac what the 5K version did for the 27-inch iMac a year ago: it gives it a Retina screen and leaves pretty much everything else alone. You do get a handful of nice internal upgrades, including Intel's Broadwell CPUs and GPUs, Thunderbolt 2 support, and faster storage and RAM (all also available on the refreshed non-Retina 21.5-inch iMacs). But for most intents and purposes, this thing is just a 2012-era iMac chassis with a nice sharp screen installed in place of the old 1080p display.Believe it or not, but that $1500 base model? It comes with a 5400RPM hard drive. Unacceptable.In any event, Apple also replaced its keyboard, Magic Mouse, and Magic Trackpad. As a fan of Apple's current keyboard (I know I'm the only person who actually seems to really love it - it's the only keyboard I use, on my PC even), I'm excited about the new model because you can also use it wired. That said, it's a whopping i129 here, which is kind of insane.