hi all,i got the siggy well over a year ago and use it regularly on my 60d,although i like it i do find it not so sharp wide open,i recently got a 70d and with the same siggy the images apear to be sharper wide open and stopped down,i didn't do any ma adjustments on the 70d for it,maybe its just me but could a 3rd party lens be more sharp on 2 similar model cameras.


