Wouldn't be the first time we see sample variability in even the high-grade Sony lenses, your sample must be better than mine. I'm considering to dump the FE 16-35mm in favor of the upcoming Zeiss Loxia 21mm, not because of sharpness but because of my difficulties in nailing focus with the FE 16-35mm, AF or MF. Although legacy glass is slower to operate I feel much more confident in getting home with critically sharp pictures.Interesting. In my test the 16-35 is better than my 35/2 at all apertures. And I have more than fairly sharp corners even at f4 with the 16-35 at 100% crop. Sharper than what I see from your shots. Agree with the focusing.