If ultimate Image Quality is your aim and you don’t mind psending 20k than check out the new Phase One XC 40 Camera. It’s a medium format camera with a fixed 40mm f/4.0 lens (25mm f/2.5 quivalent in Full Frame). It uses that crazy Sony 150MP medium format sensor that promises ton of resolution, dynamic range and color information.
You can read a small field report on this page.