Why different smartphones with same Megapixel camera have different quality of image?
I am not sure this is the right place to ask (Perhaps photo.stackexchange.com?) but this is my view on the subject. The term 'Megapixel' has little if any to do with image quality nowadays, since all the popular devices have sufficient amount of pixels. Way more important is the image processing algorithms, optics and sensor size. All digital cameras have huge advantage on the last two while smartphones usually 'make up' for this with image processing algorithms, but not enough to achieve similar quality.