It is very important - as the Cambridge site acknowledges - just what size prints you're going to make.
I tested my Mamiya/P45+ combo using the standard 80 mm lens at F8, 11, 16 and 22. At 1:1 on my computer screen, the shots at f8 are the sharpest, with f11 being very, very close. f16 is somewhat degraded and f22 is simply not sharp.
BUT...I then printed 8 by 10s and you really cannot see the difference in ANY of the shots.
THEN...I did 16 by 20s - and what I had seen on my computer screen showed through again. However, the f16 shot looked quite acceptable - until you put the f11 print beside it!
The moral of all this is simply that if you're shooting typical "book size" prints, as opposed to exhibition prints, you are not going to see the difference.
My recommendation is to test, using your most used lens and subject matter and print. Then act accordingly.