Ok, while I really like this phone for it's camera capabilities, it's fair to say my experience with the M20Pro shooter has been a bit mixed. I am coming from a S7 edge (great camera for its time). My girlfriend has an iPhone XS, so that's also a good reference.
The good: the wide angle lens is amazing, great for pictures of architecture and nature, shots look dramatic and fairly unique. Night mode is also good, when it get's it right, it renders a really impressive picture. Portrait mode is a bit agressive, but does an above average job bluring the foreground as well as the backgroud. Aperture mode is neat and more natural looking than portrait. AI is ok, it get's things right more often than not. I haven't used much the 3x zoom yet, but I guess it can come in handy.
The bad: no optical image stabilization - it may seem like nitpicking, but this phone takes a lot of blured shaky picures for a flagship, especially in low light situations. You may find yourself having to have to hold it steady and firm for a good second or two in some situations to get a usable shot. If you're trying to take pictures from moving subjects, like pets or kids, this device is not your greatest friend. The dinamic range is also not the best, lagging significantly behind iPhone and Pixel - the shadows tend to be darker while the highlights do blow sometimes. I found that a little post production goes a long way with the M20P shots - when you recover those shadows, add a tad of sharpness and maybe a bit of saturation you can make a rather dull pic look amazing - but I can understand how the average user might not want to go throught that. Also not great is the HDR, firstly because it's a separate hidden mode in the extras (when it should be a toggle always readily available on the interface), secondly because, as mentioned, while usable, it's not top class - and again the lack of OIS makes things trickier.
All in all, I am mostly pleased with this camera because of its versatility. You can acomplish pictures with the M20P that no other phone can match - like a wide angle night shot. Having said that, it's certainly not the best point and shoot phone camera out there - to get the most of it you have to wrestle through the endless menus and modes and sometimes work a bit on the post production. So, if you don't care abou the wide angle lens and just want a phone camera that spits out eye catching images 9 times out of 10, I guess you could be better served with a Pixel 3, iPhone Xs or even a Galaxy S/Note 9.
Those are my two cents, but I'm curious to read what you guys think.
Cheers.