I shoot interiors and I would love a tilt shift and full frame, but as qbfx said, I have found that lighting and pp has been huge for good shots. With the manual lens correction in photoshop and a decently framed picture to start with, I straighten verticals regularly from my 10-20 lens with great results most of the time. HDR not overdone also goes a long way. Really light, paying attention to light, and the photoshop manual lens correction are the difference in good and great pics on a crop sensor. I hate pp work, but I got onto photography for my job, and I must agree, interior pics require more pp than my hobbiest photos of equal or better quality.