I own a 600 f4 v2 and a 300 2.8v2, the new offerings give me nothing that I don’t already have, if a 600do comes out those of us with version 2’s and 3’s of the telephotos will not be rushing out to get rid of or replace our gear. Sure a couple pounds lighter might be nice, but put yourself on a diet and you just shaved a few pounds off. It always fascinates me when people talk about weight of a lens and camera and talk about a few pounds being heavy. I mean are you really that weak or just that much of a bourgeoisie? I know we all love tech but guess what, tech doesn’t always matter, a t5i and a 100-400 in the right hands will yield better results that a 1d and a 600 in the rookies hands. Yes this is a bit of a negative rant which a few will read but, at the end of the day I and many professionals will not be trading out our 1ds for a long time. If camera history has taught us anything the first few cycles of new bodies are not worth purchasing. I’ll take a heavier and more ergonomic friendly 1d series of that trash eosr with a ring on a lens and no joystick and one turn wheel and a apple Touch Bar and some goofy button layout any day. I love canon and I have given them lots of money and there are many DSLR users like me that will use the DSLR setup for many years to come. DSLR death will not be fast, and why replace what is near perfection. End of my rant