No major differences in height and width. The Note 5 is a hair shorter and 4 percent narrower.
Thinness is a big step forward for the Galaxy Note 5. It's 11 percent thinner than the Note 4.
Weight is only a minor upgrade, with the Note 5 measuring 3 percent lighter.
Both phones have aluminum frames, though the Note 5's has a more Apple-like design, with its bottom edge (just like in the GS6) looking more than a little influenced by the iPhone 6.
This is where the premium factor comes in, as the Galaxy Note 5 switches from faux leather (plastic) to a beautiful Gorilla Glass 4 back with sloped edges.
Samsung is selling the Note 5 in four different color options this year.
No changes here, as the new model sticks with the same large 5.7-inch display we saw in last year's model.
Resolution also stands pat, with incredibly sharp Quad HD resolution.
Samsung always uses AMOLED panels in its flagships. They give you rich colors, deep blacks and great contrast.
It wouldn't be a Galaxy Note without an S Pen. The stylus in the new model looks and feels a bit more premium than the Note 4's pen, but the new version's metallic-looking finish is still plastic.
Click-out S Pen
To unsheathe the S Pen in the Note 4, you have to dig your fingernails into ridges on the end of the pen. It isn't exactly a chore, but it also feels a little less than 100 percent seamless.
In the Note 5, just push in the cap on the pen and it will pop out enough that you can more easily pull it out from the phone.
The Note 4 was a fast phone when it launched, but the Note 5 should have zippier performance, thanks in part to its octa-core Samsung Exynos processor – the same chip found in the Galaxy S6.
The Note 5 also gets a RAM upgrade.
Both handsets ship in 32 GB and 64 GB options.
But the Note 4 is the better choice for storage, as Samsung dropped the microSD slot from the new model.
The Note 4 has a very good camera, but the Note 5 gets the same excellent cameras found in the Galaxy S6 and GS6 edge.
Physical camera shortcut
Like on the GS6, you can double-tap the Note 5's home button to launch its camera.
Camera aperture (rear)
The Note 5's camera has slightly wider aperture.
Both handsets' rear shooters have Optical Image Stabilization.
The new model has a slightly lower-capacity battery, but that doesn't mean it will have shorter battery life.
When using the stock cable, both handsets can juice up quickly from a nearly-dead battery level.
The Note 5 has wireless charging built-in, but it also has a new fast wireless charging feature that can juice up the phablet from 0 to 100 percent in about 2 hours.
When Samsung Pay launches, the Note 5 will let you use your phone as a wallet – not only at NFC terminals (like Apple Pay) but also at standard credit card readers.
The Note 5 has the same touch-based fingerprint sensor found in the GS6 (similar to the one in the iPhone 6), while the Note 4's sensor requires you to drag your finger across the home button.
Heart rate sensor
Both handsets have heart rate sensors on their backsides.
Samsung is launching a new BlackBerry-like keyboard cover that slides onto the Note 5.
Gear VR compatibility
When the "full consumer" Gear VR launches, we'd be surprised if the Note 5 wasn't part of the fun. But right now, it's left out of the Oculus-powered virtual reality party.
The Note 4 works with the original version of the Gear VR, which has a wider field of view than the GS6 edition, but – much more significantly – has overheating problems. Long term, we'd bet on the Note 5 being the much better bet for VR.
The new Galaxy Note has a nifty feature that lets you scribble notes on its black screen after pulling out the S Pen (a trick that's only practical on AMOLED displays). It lets you jot down thoughts without even waking your phone's display.
Have you ever wanted to grab some content on a Galaxy Note that couldn't fit on one screen? The Note 5 lets you do that, capturing things like long documents or entire web pages.
Both phones have Android Lollipop at their cores, with Samsung TouchWiz on top, but the Note 5 will likely stay up-to-date longer than the Note 4 will.
The Galaxy Note 5 launches alongside the Galaxy S6 edge+ this month. The Note 4 has been around since last October.
Starting price (full retail)
Prices on the year-old Note 4 vary a bit, but the Note 5 is launching at around the same price points we've seen for every Galaxy Note.
Just remember that most people won't need to throw down US$750 at once; some carriers still offer on-contract pricing (usually starting around $300) and installment plans that let you pay the full price over two years.