i've been trying to keep my 70-200 on my 5diii because i feel like i haven't really used it enough to have a feel for it. am i only one that often either finds it too short on one end or too long on the other? i shoot out doors and anything from birds to landscapes and sometimes it works for both but more often than not it doesn't. i rarely carry my 300 with out the 1.4 t/c. so, i'm thinking about just getting rid of the 70-200. i want to love it but i really don't. i did kind of like it on my 550d. if canon would hurry up with the next generation crop bodies i'd probably be more likely to keep it. maybe i should get a 100-400 and carry my 5dc with the 17-40 at the same time. if i get rid of my 70-200f/2.8 is and my 300 f/4is for a 100-400 will i be giving up a lot of iq?