While nothing looks different on the outside, a lot has changed on the inside of the new iPhone 6S. Bloomberg's Sam Grobart reviews the Apple iPhone 6S and 6S Plus and notes that the A9 processor is ludicrously fast.

Bloomberg notes that the unglamorous performance boosts may not get the crowds on their feet at product launch, but they're exactly what a great smartphone needs to achieve. With prodigious speed, well-thought-out interfaces, and flawless hardware-software integration, these new iPhones provide the tool for whatever it is you're doing and just let you do it. The best thing about the 6S and 6S Plus isn't all the new stuff to pay attention to, it's all the stuff you never notice.

Maybe that's what's most impressive about the new iPhones—the things that fade into the background. We're used to hearing that new smartphones have a faster processor than the old Phone, but in this case, Apple's A9 processor just screams with speed. In the video review, Gobart says the A9 processor is "ludicrously fast." Moving between apps is lightning fast. Fast-moving games are as smooth as Billy Dee Williams on a silk surfboard. The Touch ID sensor is instantaneous: By the time you've pressed the home button to wake up the phone, you've already authenticated yourself and are on the home screen. The new iPhones can get on faster Wi-Fi and, where available, 4G networks.

On 3D touch, Apple nailed it, says Grobart. Businessweek was so taken by Apple's new 3D Touch that they dedicated an in-depth report on it titled "How Apple Built 3D Touch." In that report that noted that Jony Ive is proud of 3D Touch "because it improves the experience of owning an iPhone, but he's also proud of what it says about Apple. He can't think of another company that would have put so many resources into such a seemingly subtle, yet potentially profound, change.

In today's review, Grobart continues on that line of thinking by stating: "It's easy to imagine how another manufacturer would try to do this and how it would be a mess. You wouldn't know how hard to press; you'd press too hard; there'd be a lag and you'd press again, only to find that you had pressed twice, probably causing you to throw the phone across the room."

The last upgrade of note is the way the 6S and 6S Plus can take selfies. The problem with front-facing cameras is that they often lack a flash capacity. If you shoot in a dark bar, your photo is going to be dark. Instead of adding a second flash, Apple has turned the display into one when needed. When you are taking a picture of yourself, the phone's display will brighten to three times its normal level to illuminate your face.

Apple even went so far as to design a specific microprocessor to control the color of the display's glow. The phone can sense the ambient color of a room and make sure you're lit in a flattering hue. It's mightily clever and, like the best features, completely automatic. For more of the review, see Bloomberg Businessweek's report here.

Another nice iPhone 6s review was published today by USA Today's Ed Baig and you could read all about it here.

Update 8:10 AM PST: Another review on the iPhone 6s that was published today that's worth noting is one from TechCrunch's Matthew Panzarino that's quite in-depth and you could check it out here. 

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