Just a quick update since I just checked this out. On my Roadie 28mm with CF and with my IQ 160 I was able to get a safe movement of about 7mm in either direction. Now with a crop sensor of the IQ 140 that number just went up to 12mm of movement in either direction. So given IF I can PULL the the camera back to the same focal length that would equal the FF IQ 160 than my net movements would be more . Let me be clear i have to move back and as we all know that may not always be the case. So in effect I actually gained something here. Not a bad thing
Remember the 28mm Roadie is equal to a 18mm 35mm equivalent and with the IQ 140 it is 22mm. So i would have to pull back 4mm of focal length to match the 160 sensor size. For arch. shooters its all about Rise/fall and than its always about the damn wall behind you as well.