I’m a little worried about the sharpness at 800mm, although the 1.6x extra length over the 500 should outweigh it by far – 60% extra reach really boosts the resolution and contrast can be improved in post. I hope to check it out myself by beginning of January if I got my order in earlier enough. The crucial test for me is it against the 100-500mm with 2xTC.
“it delivers sharp results throughout most of the zoom range, although 800mm sharpness and contrast could be a bit better in initial tests.”
“The major deterrent for serious action photography is absolute image quality at the 800mm setting,”
“Nonetheless, the images came out crispy, with plenty of detail and with next to no color aberrations if you disregard color noise of the sensor. Of course, it is not on the same level as the brilliant RF 100-500mm f/4,5-7,1 L IS USM”