I think that particular photo could go either way. Personally, I went from an iPhone 6 to a Pixel and then to the 7 plus, and I find the camera lacking in comparison to the pixel now. The front camera is fine, but the back camera on the Pixel was faster, sharper, and produced more vivid colors. Can't speak to the 8, but I personally found the test images not representative of the Pixel's quality in comparison to the other models listed.

"Vivid" often doesn't mean it's color accurate.

I think both the Pixel and iPhone Plus take some of the best mobile camera photos out there. The Pixel is much, much better at low light. However, the iPhone reproduces colors in a more realistic way. Most Pixel photos usually seem to have a harsher color tone, brighter/whiter, very cool like LEDs. The iPhone seems to favor a more warm color temperature, which I think generally produces worse low light photos, but more accurate color reproduction.

OP might have a monitor which shows the colors in a different way or just a different aesthetic for pictures.

First, we're comparing a 2048 x 1536 photo to a 4032x3024... so of course the iPhone will have better detail when zoomed in.

As for color, that is somewhat up for debate. I would say that the color of her lipstick in the iPhone looks unrealistic and she's probably not nearly as tan as the iPhone makes her look.

Well it’s a better second camera in iPhone that allows optical zoom, I don’t see why we should disregard that fact in comparison?