I know the extenders will work with the 135L, but I am specifically asking whether anyone has used the 1.4ex with the 135L. I had the 2x a few years back and used it on my 400mm and 70-200 but was disappointed. From what I have read I understand that the 1.4ex is sharper? Anyone try this combo on the R yet? So glad to not have to worry with AFMA.