Hi x33133x,
If you really do study the shots closely, you would indeed find the shot taken at f/1.4 to be soft.
Of course by taken a full frontal shot of the newspaper page, it's hard to tell. It may be good to take the page from an angle and tell yourself which character you are auto-focusing at, and examine that particular character closely to see if it is sharp at the character itself, or the character in front or behind it.
This problem plagued me for a while before Canon Service Centre checked and determined my 50mm f/1.4 to have a front focusing problem. Ever since the calibration, the focus point has no problem.
I would suggest you bring it back to CSC for a check esp if your lens is still under warranty. Otherwise you will never have peace of mind.
My opinion.