Basically one of the best lenses ever.
This sort of lens makes me really rethink my idea of buying a mirrorless.
as a user of this lens , I must say their review of this lens is spot on.
this is the sharpest lenses I have ever used and it is a great lens.
but unfortunately, I do not find many apps I can use it for , it is the best optically corrected lens , no doubt about that , but the focal length and FOV is not my very favorite , and it is so huge and heavy(and in the winter , I am sure it will be very very cold in my hands).
if you use 135mm often , just get it , other wise , the Canon AF version or 70-200mmf2.8 is close enough in real life practical use.