The 500mm is the best for my needs guys. 600 f/4 and 400 f/2,8 are also as good as the 500f/4 but the packet that 500 offers is the best for me (reach, weight, sharpness...). So it's my only choise for now. The problem is the chance of the new version to be released soon...Otherwise, i i'll go for it...and i think that's what i will do...


One more question, with the 1,4 extender on, the IQ will be better than my results now with the 400 f/5,6 and 100-400??