The Nikon D800 is one of the best DSLRs currently available, and is noteworthy not just for its ability to shoot very sharp 36-megapixel images under just about any lighting conditions, but for its excellent performance as an HD video camera as well. Its auto-focus is fast and accurate, and its full-frame sensor works with just about any Nikon lens made in the past 30 years. The only major downside of the camera (besides its price, and the fact that you'll want to spend even more on lenses to go with it) is that those 36-megapixel files can take a lot of time to write to memory cards, slowing its burst mode a bit. If you're a pro-level Nikon shooter, or want to take your photos to the next level, there's very little to dislike about the D800. If you're a Canon shooter, the good news is you don't have to switch, since the EOS 5D Mark III is equally capable.