Hi,
I'm not sure if asking/offering "likes" is allowed, but I will nonetheless express my view on the contest.
Maybe a mod will pop and say something at some point, and I'll abide to that.
I don't think I need the 77mm, I already have that focal pretty much covered by a 55mm f/1.8 and a 100mm f/2.8, it's just a matter of steps forward/backwards after that...
I really lust (I have been since some time) after a (very) wide quality prime though, so my "target" is the 15mm...
I think that, in the unlikely eventuality that I win something, I might also try and PM the other winner proposing an exchange (if it is possible/allowed).
One can dream, no?
I don't think I'll have time to compete for first place not even for one day, competition is really fierce and I don't have much time ATM...
I think I'll settle for 10th place every day, building up a few points, and then hope for the best.
Good luck with your challenge!