I've seen some of the review photos. It seems like the iPhone 7 Plus has a much better portrait mode, and the Pixel doesn't have OIS, and it doesn't seem like it can focus as closely and have as shallow a depth of field as the iPhone 7 for close up shots, but for 70% of most photos people would take, the Pixel camera seems to be better. It's especially impressive in low light, although some of the low light shots I've seen were with the Pixel and iPhone 7 mounted on tripods, which seems unfair since the iPhone 7 has OIS. Any camera can properly expose a scene on a tripod if the shutter remains open long enough—although that can add noise, especially if it's warm out.
I'd be interested to see the EXIF data for this shot below in particular, because as someone who has done a bit of professional photography work, the image below doesn't seem right. If the room is actually dark, you only get results like this when using a flash if you have a pretty long exposure combined with the flash using a diffuser, or have an off-camera fill flash. Either that or the Pixel has a magical high ISO imaging sensor similar to that found in Sony's $3000 a7SII. The only other scenario (and most likely in my opinion) is that the room itself actually isn't very dark, and the iPhone is horribly underexposing when using the flash, which is a viable possibility but should be easily fixable with a software update. Sometimes it also depends on how you use the camera. If you tap to focus on the white dress, the iPhone will expose for that making everything darker. But if you tap more on the model's face, near her dark hair or the background, then it will expose for that and make everything lighter. Back in college I used to do a ton of long exposures around town in the middle of the night. What gives away the Pixel shot for me are the starburst rays I see on the lights on the ceiling. I would see those a lot in longer exposures and they aren't apparent in the iPhone photo. So either Apple messed up or someone didn't lock exposure properly. If they didn't tap for exposure or focus at all, then the iPhone software messed up.
Something else I noticed in some of the photos is that the Pixel seems to do a better job cutting down UV haze in landscape photos. Either it has a better filter or is doing something in software, similar to the reduce haze feature found in Adobe Lightroom.