The two handsets are about the same height, but the Nexus 6P is 6 percent narrower.
Technically the Nexus 6P is 28 percent thinner (and, make no mistake, it will feel much thinner in hand), but remember that last year's Nexus 6 had a more rounded back. Its depth measurement only counts its thickest point, so the discrepancy may not feel quite as wide as it looks on paper.
Here's something you don't see often: a new flagship phone with a screen that's smaller than the one it's replacing. The Nexus 6's display is 9 percent bigger than the 6P's.
Did Google decide that it went a step too far with that enormous 6-inch display last year? Was the phone confined to a more limited audience than Google had hoped because of its pocket-busting size? Whatever the reasons, a smaller (but still very big) display is what we get this year.
For the first time, a Nexus has a fingerprint sensor – a good fit for the new native fingerprint support in Android Marshmallow.
Unlike the sensors we've seen on iPhones and Galaxy handsets, the Nexus 6P's sensor is on its backside.
A 0.7 MP resolution "downgrade" in the rear camera doesn't mean the new model won't take much better pictures, as Google is advertising.
That higher-res front shooter, though, will mean sharper selfies.
Camera aperture (rear)
Physical camera shortcut
Starting price (full retail)
Google is still selling last year's model for the same US$499 starting price that the Nexus 6P now rings up for, but head over to Amazon and you can shave $149 off of the 2014 model's price.
It's too early to say if the 6P is worth that difference (stay tuned for our full review), but, if you don't mind its enormous size, we can say that the year-old Nexus 6 still makes for a pretty good buy at that price.