It is very difficult to get a 64Mpix photo in native resolution from the camera. Even if you use --mode 9152:6944 --width 9152 --height 6944 in libcamera-still, the library will still only return the photo enlarged to 64Mpix from 16Mpix. That’s why you can’t see much difference.
The difference was only when I used picamera2 to get the native 64Mpix resolution from the camera with Sharpness = 2
#!/usr/bin/python3
import time
from picamera2 import Picamera2
from datetime import datetime
manual_focus = 428.0
picam2 = Picamera2()
picam2.set_logging(Picamera2.DEBUG)
picam2.options['quality'] =95 # values from 0 to 100
capture_config = picam2.create_still_configuration()
picam2.configure(capture_config)
#picam2.set_controls({"AfMode": 1 ,"AfTrigger": 0})
picam2.set_controls({"AfMode": 0, "LensPosition": manual_focus, "AnalogueGain": 1.0, "AwbMode": 5, "Sharpness":2})
picam2.start()
#for autofocus
#time.sleep(35)
#picam2.capture_file("demo1.jpg")
#picam2.stop()
file_name = datetime.now().strftime("%y_%m_%d-%-H-%M-%S")
request = picam2.capture_request()
request.save("main", "/home/pi/Desktop/Images/"+ file_name +".jpg")