Just got a 70-200mm f4L IS USM a few days ago and absolutely love it. Extremely sharp, fast and accurate. While the whiteness will attract attention, I plan to get a lenscoat or something to conceal it because I plan to do a lot of nature shots.
Best of luck with your new lens.
Your enthusiasm come across in your post and that’s great.
#1 is probably the pick of this selection.
Really good action with the main subject.
Pity about the 2nd bird behind the main subject’s RH wing but
there was nothing you could have done about that.
#2 is probably next best but I think maybe a little more space might be better.
I think 3 & 4 suffer from the fact that the subjects are photographed from behind.