Interesting. I was looking at the Oppo reno which, at about half the price of the X2 comes 5th in the Tech Advisor Best phone camera review of 2020.
So I did the obvious and opened up the top 7 sites on the search results for "best phone camera 2020". I entered all their findings on a spreadsheet and scored each phone. 1st place got 10, 2nd got 9, etc.
Here's the top 5, the total points and cost.
Pixel 4 55 £500
Iphone 11 Pro 54 £1049
S20 Ultra 33 £1200
P40 Pro 24 £900
P30 Pro 17 £899
At nearly half the cost or more of the other phones the Pixel 4 is looking quite nice.