It all depends on your shooting style, manual focus is really fun in photography. If you are doing street or portraits only, it would be nice. But if you shoot sports, wildlife, or landscape, you wouldn't be able to hit tack sharp focus. I carry a voigtlander 40mm f/2 in my bag, because itsngoodmfor m/f. If you make the in envestment in Nikon glass, you wouldn't be taking advantage of a dslr. Maybe start with some cheap canon primes, like the 50 1.8, and the 35 f/2, because they are bad at af. If you enjoy it, buy the Nikon lenses, and then if you want to stop m/f-ing, just sell your canon gear, and you then get a Nikon dslr.