First of all, I do own a Nikon N90s. Two, actually. I am totally and completely satisfied with their AF speed and accuracy. I like having a single AF zone, I don't like a viewfinder cluttered with a bunch of AF brackets. I don't need to use G lenses, I don't want an F5, F6, F100, N80, etc. So my question is, how does the F4 compare to the N90s?