Sony, Canon, and Nikon all produce good glass and bad glass

Brilliant glass

Sony produces some of the best glass and the A7RII is the best camera body I have; but the Sony 70-200GMaster is a flawed lens, until they fix the autofocus issues

Heavy, but what do you expect from such great glass.

That’s one of the downsides of good glass

Sony, Canon, and Nikon all produce good glass and bad glass

My ancient 100-400mm G A-mount outperformed this "GM" lens with no effort.

L II.It is as sharp.