Getting the 600mm itch again, and 2019 may the year I'll give in and scratch! 
For 600/4 II or III owners, do you have any trouble with carrying the lens as a carry-on item? I was wondering the size makes it an issue, especially if we are talking about international carriers who tend to be a bit more picky about size.
I have a 500/4 II right now, but the new 600 III looks delicious and most importantly, it is lighter than my 500. Just need to find the extra 4-5 grand for it! 


