Somebody has to.
Testing the new Sigma 150-600mm Sport Telephoto. I love it for being tack sharp almost all the way across the lens. Maybe just a tiny bit soft at the edges at 600mm @ 6.3. Autofocus is quite quick and it stays locked on target using the back button focus as good as my 80-400 nikkor. Best feature is the ability to lock the lens at any focal length.
The big drawback to the lens is the weight at 6.3lbs makes it almost a gimballed head tripod lens. it's a bugger to handhold but these shots are handheld so not impossible. Maybe I'll have to hit the barbells again.