I couldn't agree more. The comparisons with other zooms in the same range mean little to me since the point of discussion always seems to be sharpness. In the first place the Zeiss 16-35 f4 is very sharp, in the second place Zeiss lenses have that extra nice colour rendition, pop and contrast (known and generally acknowledged already from their Contax days) which puts them apart from the maybe tiny bit sharper but more sterile lenses (don't be offended, it is always IMHO). If you want extra sharpness on top of that then you should go for fixed focal, e.g. Batis lenses. I have several and they absolutely shine in all aspects. Also, requirements for sharpness have to be seen in the light of what you are going to with your pictures. I develop my pictures on a 30 inch Apple cinema display, and print maximum A3 size. With the lenses I have I can even crop an 85mm picture to approximately 200-300mm size and still get tack sharp results. Of course, if you want to blow up your picture to wall size then your criteria may be different.