I don't think I was clear. The test chart was with flash. The shots of the fence were in ambient light.
All I'm saying is that, for the money, the 35-70mm f4 is a respectably good and sharp lightweight walkabout lens.
Yes, wide open f4 @70mm it's a bit soft but, outside you can stop down to f5.6/f8 to get the sharpness back. This is true for most zooms which are a compromise lens after all.
Indoors it won't won't hold up against a more expensive f2.8 zoom; I would then be using my 50mm f1.7, 24mm f2.8 or 17-35mm f2.8 D.
If I had the necessary $1750 for a Carl Zeiss Vario-Sonnar T* 24-70 f2.8, I could happily dispense with all these lenses. But I don't, yet.