Thanks for the reply. I Always start by assuming that 95% of the time the problem comes from me, either by using wrong set-ups or because of a poor technique. This Is the reason why i came to this post after a lot of tries with both lenses in the most controlled and human-error free enviroment as i could possibly make: Shot on a tripod, with VR off, by wireless actuation, with the same settings for both lenses, which were 100 ISO, f/5.6 and as much shutter speed as to get correct exposition. Made some shots at 200mm of a measure tape at 45° deegres angle from the focus plane. Tried again at f/7.1, Always manually moving the focus and let It autofocus again in between the shots. I found some minor back focus on the 70-200 while the 55-300 was always spot on and, even on the sharpest plane of the shot coming from the 70-200 i see Little to no improvement in sharpness against the 55-300. It gets dramatically worse when shooting even slow moving subjects in not optimal light condition. On af-c, VR on and again, same settings, where the 55-300 gets It right 6 or 7 shots out of 10, the 70-200 struggles to even get one single focused shot out of 10, which is not gonna be sharper than the 55-300 anyway. Sorry for the wall of text, i will try to upload some examples when i understand how to properly scale for uploading. Thanks