Hmm, well the Alpa are some beautifully crafted cameras. For shooting Architecture though, especially interiors, I prefer the focus control that my Arca affords. Using tilts and swings, I can achieve sharpness that is just ridiculous and not attainable on a plate camera (other than the likes of the Artec). Also, I like to have a lot of lenses at my disposal and have you seen how long the helical mounts are for the longer lenses? I can fit my Arca, digital back, charger, cables and Rodenstocks (35, 45, 55, 70, 90, 135) in a Pelican Studio Cruzer.
Still, I wouldn't mind me a 12 Max and the new 23 HR.... DAMN those sexy cameras