My buddy who is a cps member is getting one on loan. He'll have it april 2nd. so I should get a day of seat time with it. We both think it'll be perfect for his kids baseball/football but he's worried about the F4 (most his kids games are night)
I wanna try it out then run away from it lol
Ironically, I've found kids night time football lighting to generally be better than indoor venues. Most of the fields can easily be found at night from miles away by following the alien glow in the dark, far surpassing the (inevitable) nearby mall/shopping-center lights.
I suggest you be rightly concerned about testing that 200-400. I think that between shooting the 300/2.8 + 1.4X one stop down for sharpness and the 200-400, you're going to be buying another expensive piece of glass. 


My bad shoulder (at the time) would have really hurt then.
