As has been written before (this topic has been covered extensively on other threads), I ascribe no special value to a full frame negative. It it works that way, it gets printed that way; if it doesn't, it gets cropped.

I also like to always keep my P67 in landscape format rather than ever tilt it on the 'pod, and I'm very partial at the moment to square compositions, so I often actually intend to crop when using the camera that way in the first place. The 4x5 is sooo easy to change from landscape to portrait format that I'm less likely to mess with those negatives.