Canon's newer TS-E 24 and TS-E 17 have flexible movements and very good optical quality at least in the ~21 megapixel range, at that resolution you can generally do larger movements than you can with a MF system. The TS-E 24 gives decent quality in combination with the 1.4X version III teleconverter as well if you need a ~35mm focal length. So if you only need around 20 megapixels and these focal lengths I think it is a good system, better than D800. The D800 PC-E lenses don't have that flexible movements either, and the 24 does not have as good optical quality as the Canon counterpart. Canon's live view is better too. Canon is rumoured to update the 45 and 90 TS-E to the more flexible design and better optical quality during 2013, but we'll see about that. The current 45 is a bit poor optical quality, the 90 is good but has inflexible movements (like the 45).
I have the TS-E 24mm on a Canon 5Dmk2 myself and a Linhof Techno system with a 33 megapixel back. I use the cheaper Schneider digitar lenses. I do mostly landscape though. For professional indoor architecture I'd rather use a pancake camera with HPF ring. Pancake camera without HPF ring seems to me to be a waste, so I'm not so sure about the Cambo, although you can add HPF rings to most(?) lenses. The advantage of Cambo is that it is the system that it is easiest to find second hand parts for on the forums. The view camera works indoor, but one need some dark-gg focusing skill and a back with working 100% focus check (or tethered), so if you do indoor occasionally but mostly outdoor and use a bit longer lenses the view camera can be a good choice (it becomes cheaper if you have many lenses).
I've used a 22 megapixel back recently as my 33 is on repair, and with that I'd say that it is impossible to fail concerning focus ;-). However, indoor wide angle with center filter and without flash at f/16 the shutter speed is immediately up at 30 second limit...
If you don't intend to go for higher resolution than your current 22 megapixels I'd surely take a deep look into a Canon system. Make sure to look at what focal lengths you need too. The largest weakness with the DSLRs is the lack of a proper 35mm focal length with tilt/shift, which actually is my favourite focal length for my photography (I use the 47mm Schneider Digitar on my Techno), although you may find the TS-E24 + 1.4X teleconverter to be "good enough".
Also be prepared that although tech cam lenses are the best they are not perfect, it is difficult to make wide angles with perfect corner sharpness also on tech cams. On the 47mm digitar I see some slight chromatic aberration even with the 22 megapixel back, but it is also an older generation lens, but cheap too and can do large movements. The 35mm digitar has some problematic field curvature. If you need to get the latest Rodenstocks to fulfil your quality expectations the cost can become very high indeed.