A recent picture I took with my 5700 has the following EXIF data;
Original Colors: 16,7 Millions (24bit)
Current Colors: 16,7 Millions (24bit)
Number of unique colors: 197280
You can see a big difference between 16 and 24bit on your computer screen settings...imagine a 12bit image !? Yuck.
Besides...look at your pictures, you can tell they are not 12bit and that they look every bit (no pun intended) as good as a film SLR.