For those who don't read Consumer Reports regularly: they have tested the Pixels, they just didn't rank in the top 10 for camera performance. They ranked all of the phones in this "Top 10" "Very Good" for image quality (none got an "Excellent" rating), but the iPhone variants pulled ahead of the others because they got an "Excellent" rating for HD video recording.
The Pixels are out of this Top 10 because of their combined scores for other features - i.e., they weighted the camera performance first, but where there were ties (i.e., many of the top 20+ phones scored similarly), it appears they went by their overall rating, and the Pixels are JUST out of the top 10. They did state in the article that the variation between any of the top phones is minimal, in their opinion.