Recently, the website pocket-lint.com reported that they were having "sharpness issues" possibly due to phase-detect (viewfinder) AF problems or mirror-slap vibration being magnified by the high-res sensor.
You can see their report here: pocket-lint: "not sharp when using viewfinder"
I am here to allay the fears that the D5200 is plagued with "soft" images. The images I have been producing with the D5200 are indeed tack sharp and there are no AF issues that I've found.
I tested my D5200 on a tripod using a variety of lenses at different focal lengths with different apertures at many different shutter speeds. Even at shutter speeds up to 2 seconds long I have found NO mirror-slap vibration related softness. I have found the phase-detect AF to be accurate on fast and slow lenses, pro lenses, kit lenses, zooms, and primes.
Here are a couple of example shots .The screen grabs show the images at 100%. The lens and exposure info is displayed. The images are displayed full size for easy viewing of the sharpness. These are straight RAW files. No sharpening, no exposure adjustment, Tungsten WB set in-camera.
The D5200 images are just as sharp as the images from my D600. If you're looking for a good sharp camera don't worry. The D5200 is so far excellent.
Stay tuned for a full review.