The Nexus 6P vs the Pixel XL
https://lh3.googleusercontent.com/-...ExUghv2JF0aiHhPCGQ5kQCL0B/h505/2016-10-07.png
6P has one thing that the Pixel XL lacks, Pixel XL has two things the 6P doesn't.
6P wins on price, it's $220 cheaper which means that the XL is 34% more expensive. I'm giving the 6P the benefit of the doubt on screen because we know that it's pretty decent in sRGB mode and don't know for sure that the XL has an sRGB. Aside from that, it wins in 1 additional category, front facing stereo speakers. They also tied on storage since both are 128 GB. Overall 4 1st place finishes and 9 second place finishes for the 6P.
XL wins on Assistant, Audio (due to Aqstic codec in the SD 821), battery life (though this is an assumption based on updated more efficient SoC, smaller display, same size battery), Camera, Charging tech, Processor, Software, Security, the IP rating of IP53, Software updates and being DayDream ready. It has 12 1st place finishes and 2 second place finishes.
So if getting the following isn't worth $220 to you, then don't buy it. But you can't say there is "no value add" over the 6P, since the 6P just got trounced.
Assistant
Battery life
SoC
RAM
IP Rating
Camera
Software
Security
Software Updates
Daydream