I shoot with sony and have no complaints.
my 28mm has image stabilization as well as my 500mm reflex, and everything in between.
and the 500mm is autofucos, can't find that with canon or nikon. yes i have got some very sharp pictures hand held with the lens.
not sure if you can find image stabilization on 28mm prime on canon or nikon either?
currently have the a350 and the a700, will soon add a full frame to it either the a850, if it's real or the a900 replacement, a950?
sony, nikon, canon they all make great cameras and a good photographer will be able to get a great image using any camera from any of these manufactures, go try out the cameras if you can to see which fits you best.
sony has plenty of lenses and can also use most auto focus minolta lenses since 1985.