Thinking of switching from 80d to 7d Mll. I am an avid bird in flight photographer and like the 7d Mll with 10 fps, 65 focus points, dual card slots and weather seal. The 80d has 7fps 45 and no weather seal. Would really like a 1dx but that is out of my paygrade, was ready to pull trigger on a used 1d MlV at around $1000 but for $300 more I can get a new 7d with up to date system and the controls seem to work same as my 80d and 6d Mll. Really like the 80d but do not see any downside to an older camera. Any thoughts.