I find my lens a bit soft when I am close to the subject (closer than 0.7 meter) and shooting 70 mm at 2.8. It´s a huge difference if I compare it against stoping down to F4. At f4 it´s very sharp.
If I compare f2.8 and f4 at longer distances than 0.7 all images are razorsharp. Can´t see any difference. This issue with the sharpness are only at 70mm. Anyone else who got this on their lens?