tkbslc wrote in post #16249159
If you look at the actual sharpness score (P-MPIX) the 85mm and the 70-200 are both the same. The overal DxO score is kind of odd in that it heavily weights things like T-stop. Since the 85mm is 2 stops faster than the 70-200 f2.8, it gets a big bonus in the overal score. Of course that is irrelevant if you value the range and/or don't need a faster lens. That's the same reason the 85L scores so high even though it is less sharp and has more vignetting and CA than the 70-200. It's still 2+ stops faster, so big bump in the overall score.
I think you could have DXO test a Vaseline smeared f0.95 lens and it would achieve the highest overall score due to their silly score formula.
DxO scores things like sports and wildlife shooting, so they explain that faster lenses are necessary to freeze the action at fast shutter speeds. Of course, they also explain that "fast" lenses are f/4 and wider (and T-Stop f/3.2 or better). Merely having a fast lens doesn't ensure a high score. They also give points for Portraits and Studio for faster lenses (same speed I noted previously) to provide the thin depth of field to create a more pleasant subject separation.
Sure, if you don't need f/4 and faster lenses then the DxO scores for portraits and sports and wildlife and street photography, etc. then the DxO scores probably aren't helpful to you. But most people do shoot the kinds of photography they test for. Finally, speed alone doesn't ensure a high score (e.g., the Carl Zeiss Planar T 50mm f/1.4 ZE Canon is a very low scoring lens on DxOMark).