So I just looked at the comparison photos from gsmarena tool, comparing mate 9, mate 10 pro and mate 20pro (and Iphone XS max). If we look at the wool ball, or the trains map, I don't know what Huawei wanted to achieve with the mate 10 pro, but it's the only one that is over sharpening and with this strong oil paint effect. Mate 9 and 20 pro are just good regarding these points, and that is regardless of the amount of light.
Shame there is no correction from huawei on the jpeg processing.