We have a Canon 5DS R and it is just amazing. We shoot our oblique angle aerial photos from our Cessna 182T. With a full frame sensor and 8688x5792 pixels. We shoot everything in RAW mode, and use Photoshop to open them and save them as a TIF file. Right from the camera it is a 28.96" x 19.307" image at 300 PPI. The file size of a tif file right from the camera is 147,454 KB
We just delivered one print of a customer's business campus as a 40x60 print and it is just stunning in clarity.
Back in the olden days (10 years ago) we flew the same area and used a Mamaya 6x7 film camera, with a 300MM lens, which is about the equivalent of a 200 MM lens on a 35mm camera. For the non photographers that is a piece of film with a 6x7 CM or 2.25" x 2.75" so a lot of area for the image. We would scan that on our $90,000 photogrammetric scanner at 14 microns resolution and produce a 250 MB file or so as I remember. Anyway that huge piece of film scanned with the top level professional scanner was not as good at the 35mm size from of pixel in the Canon.
This is a low res version of a photo we shot of the OU-TX game. In the full res image you can zoom in enough to see some of the OU players with hands in the air signaling a touchdown. It is very obvious from the color difference of the two ends of the stadium where the fans are seated for each side.