I would move the image quality discussion to the computer. Have him visit the spartancamera portal. Look at the uploaded photos on his computer screen which is much bigger and higher res than the phone's screen. Either these are acceptable or they are not.
If they are, then it may just be a matter of the phone's screen being very small and maybe not as crisp as a computer monitor.
Load the app on another mobile device and compare.
Additionally, pull the SD card and study the original photos on the computer.