The standard test should be, go out and shoot and observe your results.
As for reading the manual cover to cover.........well I just finished and my Cokin UV filter is no longer cracked. I can eliminate those nikon service bills from here on out just by reading the manual again. My shooting technique has been raised bar none beyond all photographers on the planet just by reading the manual cover to cover.
Most important thing I learned from reading the manual cover to cover was under
"When operating the viewfinder diopter adjustment control with your eye to the viewfinder, care should be taken not to put your finger in your eye accidently"
Seriously, the image was sharp. The more you shoot the more you will see.