As my 24mm Zeiss lens comes tomorrow, I just have a little question for landscape photography. According to SLRgear, the sweet spot of the lens is at f/4, while loosing a tiny bit of quality till f/11. So, if I shoot a landscape in good light, should I choose f/4 (dof shouldn't be a problem focused at infinity anyways) or do I have to consider something else and better shoot at slower apertures? With slower lenses, the sweet spot is normally between f/7.1-f/9, so I never really thought about this.