Upload & Sell: Off
I had been debating the merits of the Canon 17 TSE and the Zeiss 15mm for a few months. I finally opted for the Zeiss due to the ability to take standard filters, the wider field of view and the faster f/2.8 aperture. I have yet to fully explore the creative potential of this lens, but I am already impressed with the image quality in the brief time that I have had the lens.
With regard to the hood - I originally thought that I might opt for having it removed, however, after shooting the lens around waterfalls I found the hood to be really useful in keeping my polarizer more dry. After that experience I'm definitely going to keep the hood.
Finally, I want to thank Scott, Tim and Rajan for sharing their opinions on the Zeiss with me.