w/o TC it's amazing for portraits, great for outdoor action, unbelievably sharp - basically a f/2.8 L prime from 70 to 200. Here are a few shots from December: https://www.dpreview.com/forums/post/68069708
TDP called it "the sharpest interchangeable zoom lens we've ever tested" for a reason! It holds up well with the 2x teleconverter, even for regular use cases imo.