I'm smitten with the 70-300, it arrived yesterday and I've been out twice with it, yesterday with the A7R2 and today with the A6000. It's sharp, detailed, great contrast, focus is spot on, handles well and works absolutely perfectly with both cameras. I've attached a couple of images to show, the Heron with the A7R2 and the duck with the A6000, I'll post more tomorrow. I'm really pleased with it, both these shots were taken at 300mm wide open, the duck at ISO 500 and the Heron at ISO 2500!!! Totally recommended lens.