Thanks, I see it now. Interesting...
Lack of contrst could be due to: flat sky and the use of the Neutral picturestyle.
I'll shoot again under more sunny conditions.
I also noticed it in the dog hair. If you look carefully you will see it has lots of detail...but it kinda looks low contrast or as if you reduced clarity in lightroom. the 35L I use to have lost some contrast wide open. If you shot a textured white surface at F1.4 and then F2.0 both were sharp in the center, but the F2.0 one showed much higher contrast.