Well Guy thanks for turning me onto to this lens. Bought it this afternoon and traded in my old LTM version of the CV12/5.6 and CV21/1.8 both of which I seldom use. From first results I have to say I am very impressed and it so good to have a DOF scale again as I find the FE16-35 a real pain to know where it is really focussing for landscape work. Same as you I am surprised by the corner quality even wide open and could even be better than the FE16-35 at 16 (early days though). For £499.99 it is a steal