For me it's the opposite, show how smartphones are better than the current crop of mirrorless APS-C as this is the extraordinary claim requiring evidence.
When I get some time I might shoot some comparison pictures, but if I don't: remember that I'm not here to serve your demands, I'm sorry.
I have used an iPhone SE and a mirrorless M4/3 camera to photograph a sheet of paper containing barcodes of varying sizes (including some with bars less than 1 pixel wide). I then checked which barcodes were readable in the resulting image.
The light levels were the same, both cameras were positioned and zoomed so the target took up the entire image, and both cameras were supported on a tripod.
I expected the M4/3 camera would blow the iPhone out of the water with its much larger lens, bigger sensor, and higher price. But no, the iPhone's image had marginally more readable barcodes.
Modern smartphone camera performance is just crazy, for the sensor size.
Protocol: handheld at 10 PM, 10 shots each, at different ISOs, picked the best one
The bottlenecks are different, but the sharpness is comparable.
- The DSLR was limited by optics, it's blurrier with some chromatic aberration
- The Phone has strong AI processing, I wish I disabled itIt's still over-sharpened and probably used multiple shots to get high dynamic range, it's much more noisy too, and shows less resolution
Also the d5500 is a lower tier camera from 2015, the phone was released in 2021
Yes there's HDR bracketing, but we only care about the result.
One is blurry (optics), the other has artifacts (AI), but overall sharpness is similar.
Depends on what you need, of course, but for most people the photo from the phone is superior.