This lens cannot be faulted! It is supersharp, and otherwise almost optically perfect! And only as big/heavy that it has to be.

But is it worth the enormous price? I think not. The newest AF-P 70-300 f/4.5-5.6VR (for FX) and the newest AF-P DX 70-300 f/4.5-6.3VR is both as sharp and otherwise "perfect", and you get 100mm longer reach. The question then is: is it worth paying double or triple for 0.5-1,5 stop of light? I sold mine, and bought the 70-300 instead.