600mm F4 users sign in.....

Are you glad you chose this over the 500mm F4 ?

I think your asking the wrong people, you should be asking the 500mm f/4 owners why they didn't go for the 600mm, i assume price difference is going to be a large factor. I highly doubt anybody with the 600 f/4 is going to be hoarding a £7000 lens unless they were happy with it.
 
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