Used to have both Canon and Nikon (Fujifilm actually) system for about 5 months, then finally switched to Nikon system completely as tedious and headache to decide which system to bring out to shoot everytime and also expensive to maintain both systems. ;p
The wideangle shift lenses for architecture, so don't need to tilt. The PC-Micro can tilt because need to control the plane of focus for product shots. I don't think the tilt that will be useful for the WA lenses because of the large DoF, you won't reap the benefits.