For architecture: 5D Mk II, 5D Mk III or 6D?

Most buildings move pretty slow. 

I'm planning on getting a 6D for travel, landscapes, and architecture.  I've  been able to play with a 5D II and a 5D  III.  They're both great cameras but the 6D seems to fit my needs.  I like its size and features.  I like the way that it focuses.  (Yes, I'm odd.)  I can live without some of the 5D III features and save a few bucks.  The money I save will go toward the 50mm 1.2 lens.