Did you compare raw sensor output, or post-processed?
Big sensors capture more light and have more bokeh. With enough light, the first doesn't matter, and bokeh is not a thing for QR codes.
If you didn't have enough light, then it's probably the question of how denoising was done, and what details have been guessed by fancy algorithms. Geometrical shapes are easy to guess, but when I look at pictures of landscapes, they typically devolve into a painting after 1000×1000px if taken on a phone.
Did you compare raw sensor output, or post-processed?
Big sensors capture more light and have more bokeh. With enough light, the first doesn't matter, and bokeh is not a thing for QR codes.
If you didn't have enough light, then it's probably the question of how denoising was done, and what details have been guessed by fancy algorithms. Geometrical shapes are easy to guess, but when I look at pictures of landscapes, they typically devolve into a painting after 1000×1000px if taken on a phone.