I'm considering my next lens purchase for my Canon 7D. I currently own an EF70-300 f/4-5.6L IS USM and the kit EF28-135 f/3.5-5.6 IS USM lenses. I'm looking for a sharp wide angle primarily for landscape work. With the 1.6 crop factor for the 7D, it's tough to get wide. I rented the EF-S 10-22mm f/3.5-4.5 USM but it was too wide.
I'm seriously considering either the Canon EF 16-35mm f/2.8L II USM or the Zeiss Distagon T* 2,8/21. Prices are comparable. A friend had a Zeiss on his Sony camera that took great pictures.
Does anyone have experience, good or bad, with either of these lenses? Has anyone tried the Zeiss Distagon T* 2,8/21 on a 7D (i.e., will it be wide enough)?